storage filling up over time

so I recently noticed my storage was filling up rapidly over time. for example I was on my computer last night and I noticed my storage was a bit low so I started clearing some files that were leftover from some games I used to play, in the end i had 38gb and then I went to sleep and woke up, got on my computer and surprisingly I had only 25gb left. not sure how it happened but it did so basically I want to know how to find the cause of this and get rid of it. Thanks in advance.

pc details – Windows 10, HP EliteBook 8460p,