Blender can be a very hard software to even get accustomed to. There are many hidden functions and secrets that one may not even hear about for years while using the software. Wether beginner, intermediate, or advanced, it can be very helpful to review or refresh your memory on the hotkeys and what they do. Here’s a page I found that can help you learn more:
(The preview might be small, so right click and open it in a new tab to see it in greater detail)
Edit: Added @EchoReaper’s linked Blender Hotkey Sheet made by Andrew Price. Use this if you prefer more of a listed view rather than the infographic above.
Hope this helps!