Excluding earlier short lived attempts at dabbling with Linux, I've been using Linux as my daily driver for seven years (since 2013!). This operating system has a wide depth of areas to master, and I am still expanding my knowledge of the command line, available tools, and lower layers of it's infrastructure. Generally stuck close to Ubuntu (lately POP OS!), but with stints managing and maintaining CentOS servers.
A handful of cheat sheets for different applications