Game crashes and don't know how to fix it

Whenever I go to the Minecraft launcher and click play the Mojang loading screen pops up and loads halfway then it stops responding so I close the program and I get a crash report I heard that I needed to go to setting general and check the box for open output log when game starts and that when I start the game I get the crash exit code but I don't know what to do with this information, also I didn't know what affects versions was because i have only ever played java on 1.16.1 and1.16.2 so i picked the top one i hope it doesn't affect something