Last night, I was working on Photoshop and it said my scratch disc was full which, after looking it up, meant my startup disc was full. I went through and deleted a good 95% of my photos, all the apps I never use that MacBook doesn't deem necessary (because Chess is very necessary), a lot of my documents, etc., etc., etc. After that, PhotoShop worked for me.
I was working on it again today, and it said my startup disc is almost full once again? Hardly anything has changed last night. What does this mean/what do I do?