Besides playing around with the basic web development tools, I also try a lot of other langauges, libararies, frameworks, platforms, programs, building tools and operating systems. Both related to web development and otherwise.
Here I list some of them:
Industry Knowledge
Computer Science (CS)
Algorithms
Front-end Development
Software Development
Web Applications
Search Engine Optimization (SEO)
Responsive Web Design (RWD)
Interaction Design
User Interface (UI)
User Experience (UX)
Project Management (PM)
Projects Planning
The Agile Methodologies
Discrete Mathematics
Single Page Applications (SPA)
Static Site Generation (SSG)
Server Side Rendering (SSR)
Interpersonal Skills
Personal Development
Continuous Learning
Teamwork
Team Leadership
Time Management
Problem Solving
Research
Languages
HTML5
JavaScript
Google Apps Script
CSS3
PHP
Bash
C
Java
Python
Frameworks
Libraries
Misc
Node.js
NPM
JSON
Version Control
Git
Gitlab
Github
Team Foundation Server (TFS)
Design Tools
Material Design
Font Awesome
Platforms
Databases
MySQL
MS SQL
Cloud Firestore
Text Editors
Operating Systems
ERP Systems
Odoo
Office Software
Microsoft Power Query
Microsoft Excel
Microsoft PowerPoint
Microsoft Word
LibreOffice Calc
LibreOffice Writer
Spoken Languages
Arabic
English