Since all Linux distributions use the same Linux kernel at their core, no matter which Linux distribution you use, you will get all features and functions of standard Linux across all distributions.

What do all Linux distributions have in common?

A typical Linux distribution comprises a Linux kernel, GNU tools and libraries, additional software, documentation, a window system (the most common being the X Window System, or, more recently, Wayland), a window manager, and a desktop environment.

Do all Linux distributions have the same commands?

Yes. Many commands work the same way in any linux terminal (the terminal application itself may vary however, like konsole, xfce terminal emulator, etc.). The general unix commands, for example, cd, ls, rm, etc. work the same way.