Some of the languages I have worked with:
Python
Python for Data Science
Django
FastAPI
Dash - Plotly
Manim
JavaScript
React
Node.js - Express.js
HTML & CSS
Java
Java GUI Programming
SQL
Shell Scripting
R
PHP
C
Multi-Paradigm Programming and Scripting
Object-Oriented Concepts and Constructs
SOLID Principles
Class vs Object vs Instance
Methods
Variables
Modifiers
Four fundamental OOP concepts
Encapsulation
Inheritance
Polymorphism
Abstraction
Nested classes
Upcasting - Downcasting
Errors and Exceptions
Passing Object References
Connecting to a MySQL database using Java
Threads
Serialization
Object Orientation with Design Patterns
Creational Patterns
Singleton Pattern
Factory Pattern
Abstract Factory Pattern
Builder Pattern
Prototype Pattern
Structural Patterns
Adapter Pattern
Facade Pattern
Proxy pattern
Decorator Pattern
Behavioural Patterns
Chain of Responsibility Pattern
Command Pattern
Iterator Pattern
Observer Pattern
Mediator Pattern
Data Access Patterns
Data Access Object Pattern
Model-View-Controller MVC
Data Structures & Algorithms
Analysis of algorithms
The Stack Data Structure
The Queue Data Structure
The Array Data Structure
The List Data Structure
The Linked List Data Structure
The Tree Data Structure
Recursion vs Iteration
Bubble and Insertion Sort
Web Development
HTML
CSS
React_2
Ruby on Rails
Web server
Web mapping
HTML presentation with Reveal.js
Excelentes diseños de WebSites
Mobile Development
Native vs Hybrid Frameworks
Cordova - PhoneGap
Ionic and Capacitor
Systems Analysis & Design
Universal design
GitHub