minecraft is not working whatsoever

Put the summary of the bug you're having here

*What I expected to happen was that it would open normally

What actually happened was...:
It couldn't go online even though my internet was fine and my singleplayer ALWAYS crashed (it happened randomly

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. It was completely random
3. I don't know how to trigger it