certifications
github codes
 (search github: spring,
game, maze, puzzle, etc)

Expertise:

#webdev #programming
HTML/CSS/BrowserAPIs/HTTP
JavaScript/TypeScript/
VanillaJS/JQuery/
RactiveJS/VueJS/Svelte/
ReactJS/Angular
NodeJS/ExpressJS
PHP/plain/frameworks
Java/Spring
Python/Flask
SQL/MySQL/PostgreSQL/SQLite

#sysadmin #user
SSH/rsync/SSHFS
BASH scripting/GNU tools
Debian/MX/Ubuntu/Fedora/Manjaro
Windows/DOS/DOSBox

#gamedev #programming
C/C++/ASM
Lua/LuaJIT/Love2D
libSDL2/OpenGL

#answering on "how to become a linux guru" question
sustainable, slow and steady progression with concentration and sense of direction. keep space for the overall sanity of your life. learning process is difficult but keep it safe, sane and sustainable because it's a matter of years and decades. betting on "you" should be a safe bet like the many bets of our lives of humans. if you lose motivation could be a sign of sanity of your life, brain and body wanting to rest and balance again. exageration is generally bad and as such the want to excel is risky. you can also be "good enough for". good luck!