Hi guys,
I would like to ask for a brief tutorial if it would be feasible about troubleshooting software issues with the / or in the terminal?
Is this possible? E. g. for the most common mistakes that can arise?
E. g. how to find out or fixing wrong configuration files that may cause some glitches. Maybe this is way too broad, but would be nice to have some entry points to save some time, by having the ability to fix things without too much fumbling around

OK, I hope this would be doable. I don't know how to explain it right now differently *lol*