Some of the languages I have worked with:
Python
Python for Data Science
Django
FastAPI
Dash - Plotly
Manim
React
HTML & CSS
Java
Java GUI Programming
SQL
Shell Scripting
R
PHP
C
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
Web Development
Web server
Excelentes diseños de WebSites