diff --git a/Skills/Async.md b/Skills/Async.md
index 63e26c83..f2ddebc9 100644
--- a/Skills/Async.md
+++ b/Skills/Async.md
@@ -1,8 +1,8 @@
 ## Asynchronous programming
 
 - Theory
-  - Event loop
-  - `try..catch`
+  - Event loop *
+  - `try..catch` *
   - Non-blocking
   - Async I/O
   - Thread pool
@@ -22,7 +22,7 @@
   - Thread
   - Process
 - Async contracts
-  - Callbacks
+  - Callbacks *
   - Callback-last-error-first
   - Thenable
   - Promise
@@ -59,17 +59,17 @@
   - Mutex
   - Spin Lock
 - JavaScript & Node.js specific
-  - Timers
+  - Timers *
   - `setImmediate`
-  - `nextTick`
+  - `nextTick` *
   - AbortController
   - AbortSignal
   - Promise unhandled rejection
   - Promise double resolve
   - Atomics
   - High resolution clock
-  - Callback hell
-  - Promise hell
+  - Callback hell *
+  - Promise hell *
   - ref() and unref()
   - Error handling in async code
   - Better stack traces with return await
@@ -79,10 +79,10 @@
 - Techniques
   - Async.js library
   - RxJS library
-  - Promise.all
+  - Promise.all *
   - Promise.allSettled
   - Promise.race
-  - Promise.any
+  - Promise.any *
   - Web Locks API
   - IPC
   - Channel API
diff --git a/Skills/JavaScript.md b/Skills/JavaScript.md
index 0ff8fc89..673f4eeb 100644
--- a/Skills/JavaScript.md
+++ b/Skills/JavaScript.md
@@ -1,64 +1,64 @@
 ## JavaScript
 
-- Language
-  - `Object`
-  - `Function`
-  - `Boolean`
-  - `Number`
-  - `BigInt`
-  - `String`
-  - `Symbol`
-  - `Infinity`
-  - `NaN`
-  - `undefined`
-  - `null`
-  - `this`
-  - `instanceof`
-  - `...spread`
-  - `...rest`
-  - `typeof`
+- Language *
+  - `Object`  *
+  - `Function`  *
+  - `Boolean`  *
+  - `Number`  *
+  - `BigInt`  *
+  - `String`  *
+  - `Symbol` *
+  - `Infinity` *
+  - `NaN` *
+  - `undefined` *
+  - `null` *
+  - `this` *
+  - `instanceof` *
+  - `...spread`м
+  - `...rest` *
+  - `typeof` *
   - Destructuring
   - Generators
-  - Iterators
-  - Async generator
-  - Async iterator
-  - Chaining
-  - Optional chaining
+  - Iterators *
+  - Async generator *
+  - Async iterator *
+  - Chaining *
+  - Optional chaining *
   - IIFE
-  - Async IIFE
+  - Async IIFE *
   - `global`
   - `globalThis`
   - `window`
-  - Getters and setters
+  - Getters and setters *
   - `__proto__`
   - `prototype`
-  - Equality operators
-  - Logical operators
+  - Equality operators *
+  - Logical operators *
   - Logical Assignment
   - Bitwise operators
-  - Ternary operator
+  - Ternary operator *
   - `void`
   - `yield`
   - `await`
   - Template literal
   - Strict mode
-  - Hoisting
-  - `delete`
-  - `in`
-  - `super`
-  - `eval`
-  - `static`
+  - Hoisting *
+  - `delete` *
+  - `in` *
+  - `super` *
+  - `eval`  *
+  - `static`  *
   - `Number.parseInt`
   - `Number.parseFloat`
   - Property descriptors
   - Sealing properties
   - Freezing properties
   - Computed properties
-  - Instance class fields
-  - Static class fields
-  - Private class fields
-  - Private class methods
-- Statements
+  - Instance class fields *
+  - Static class fields *
+  - Private class fields *
+  - Private class methods *
+- Statements *
   - `if`
   - `while`
   - `do..while`
@@ -79,17 +79,17 @@
   - `with`
   - `new`
 - Functions
-  - Arrow function
-  - Async function
-  - Function declaration
-  - Function expression
+  - Arrow function *
+  - Async function *
+  - Function declaration *
+  - Function expression *
   - Default parameters
-  - Functional object
-  - `Function.prototype.call`
-  - `Function.prototype.bind`
-  - `Function.prototype.apply`
-  - `return`
-- Data structures
+  - Functional object *
+  - `Function.prototype.call` *
+  - `Function.prototype.bind` *
+  - `Function.prototype.apply` *
+  - `return` *
+- Data structures *
   - `Array`
   - `Map`
   - `Set`
@@ -101,20 +101,20 @@
 - Standard classes and namespaces
   - `Proxy`
   - `RegExp`
-  - `Date`
-  - `Math`
+  - `Date` *
+  - `Math` *
   - `Reflect`
-  - `Error`
+  - `Error` *
   - `Atomics`
   - `JSON`
   - `WeakRef`
   - `FinalizationRegistry`
   - `Intl`
-  - `Promise`
+  - `Promise` *
   - `console`
-  - Timers
+  - Timers *
 - Infrastructure
-  - V8
+  - V8 *
   - Node.js
   - npm
   - prettier
diff --git a/Skills/Paradigms.md b/Skills/Paradigms.md
index 91d5f7e5..7b6c3c47 100644
--- a/Skills/Paradigms.md
+++ b/Skills/Paradigms.md
@@ -1,17 +1,17 @@
 ## Multi-paradigm programming
 
 - Theory
-  - Procedural programming
-  - Imperative programming
-  - Structured programming
+  - Procedural programming *
+  - Imperative programming *
+  - Structured programming *
   - Non-structured programming
-  - Functional programming
-  - Prototype-based programming
-  - Object-oriented programming
-  - Object-based programming
+  - Functional programming *
+  - Prototype-based programming *
+  - Object-oriented programming *
+  - Object-based programming *
   - Generic programming
   - Concurrent computing
-  - Asynchronous programming
+  - Asynchronous programming *
   - Parallel programming
   - Reactive programming
   - Functional-reactive (FRP)
@@ -25,25 +25,25 @@
   - Information hiding
   - Aspect-oriented programming
   - Anemic domain model
-  - Class composition
+  - Class composition *
 - OOP basics
-  - Constructor
-  - Operator `new`
-  - Static method
-  - Method
-  - Async method
-  - Getters, Setters
-  - Public fields
-  - Private fields
+  - Constructor *
+  - Operator `new` *
+  - Static method *
+  - Method *
+  - Async method *
+  - Getters, Setters *
+  - Public fields *
+  - Private fields *
   - Field declarations
   - Inheritance
-  - Parent class
-  - Polymorphism
+  - Parent class *
+  - Polymorphism *
   - Abstract class
   - Interface
   - Encapsulation
   - Hidden class
-  - Object form
+  - Object form *
   - Instance
   - Introspection
   - Reflection
diff --git a/Skills/Programming.md b/Skills/Programming.md
index e976b503..a89e7cbc 100644
--- a/Skills/Programming.md
+++ b/Skills/Programming.md
@@ -4,34 +4,34 @@
   - Model
   - Modeling
   - Subject domain
-  - Algorithm
-  - Syntax
+  - Algorithm *
+  - Syntax *
   - Semantics
   - Abstraction
-  - Paradigm
-  - Programm
-  - Programming paradigm
-  - Programming language
+  - Paradigm *
+  - Programm *
+  - Programming paradigm *
+  - Programming language *
   - Contract
   - Module
-  - Library
-  - Package
-  - Component
-  - Framework
-  - Platform
-  - Source code
-  - Object code
-  - Machine code
-  - Microcode
-  - Software engineering
-  - Decomposition
+  - Library *
+  - Package *
+  - Component *
+  - Framework *
+  - Platform *
+  - Source code *
+  - Object code *
+  - Machine code *
+  - Microcode *
+  - Software engineering *
+  - Decomposition *
   - Control flow
-  - Data flow
-  - Code reuse
-  - Defensive programming
+  - Data flow *
+  - Code reuse *
+  - Defensive programming *
   - Don't repeat yourself (DRY)
   - KISS principle
-- Syntax and concepts
+- Syntax and concepts *
   - Value
   - Identifier
   - Variable
@@ -66,9 +66,9 @@
   - Return early
   - Fail-fast
 - Types
-  - Primitive types
-  - Reference types
-  - Type systems
+  - Primitive types *
+  - Reference types *
+  - Type systems *
   - Strong typing
   - Weak typing
   - Duck typing
@@ -81,45 +81,45 @@
   - Covariance
   - Contravariance
 - Functions
-  - Signature
-  - Argument
-  - Parameter
-  - Pure function
+  - Signature *
+  - Argument *
+  - Parameter *
+  - Pure function *
   - Lambda expression
   - Side effects
-  - Closure
-  - Partial application
+  - Closure *
+  - Partial application *
   - Currying
-  - Higher order
+  - Higher order *
   - Recursion
   - Tail call optimisation
-  - Callback
+  - Callback *
   - Listener
-  - Composition
+  - Composition *
   - Pipe
   - Memoize
-  - Wrapper
+  - Wrapper *
   - Functor
   - Monad
   - Monoid
   - Generator
   - Coroutine
 - Data structures
-  - Array
-  - Structure
+  - Array *
+  - Structure *
   - Record
   - Enum
-  - Instance
-  - Object
-  - Collection
-  - Set
-  - Hash table
-  - Linked list
+  - Instance *
+  - Object *
+  - Collection *
+  - Set *
+  - Hash table *
+  - Linked list *
   - Doubly list
   - Unrolled list
   - Circular list
   - Queue
-  - Stack
+  - Stack *
   - Deque
   - Tree
   - Graph
@@ -127,9 +127,9 @@
   - Mutable state
   - Immutable state
   - Serialization
-  - String parsing
-  - JSON
-  - JSON5
+  - String parsing *
+  - JSON *
+  - JSON5 *
   - YAML
 - Networking
   - DNS
@@ -153,7 +153,7 @@
   - Dynamic linking
   - Static linking
   - Runtime
-  - Virtual machine
+  - Virtual machine *
   - Register-based VM
   - Stack-based VM
   - Containerization
@@ -164,8 +164,8 @@
   - Code review
   - Exception
   - Unittesting
-  - git
-  - Github
+  - git *
+  - Github *
   - Docker
   - Kubernetes
   - GCC
@@ -203,7 +203,7 @@
   - Yo-yo problem
 - Runtimes and virtual machines
   - Bytecode
-  - V8
+  - V8 *
   - VJM
   - CLR
   - Mono
@@ -218,7 +218,7 @@
   - Unix
   - BSD
   - MacOS
-  - Windows
+  - Windows *
   - Real-time OS
   - Embedded OS
 - Standards