Storage Issue

Hello,

I have a Lenovo Yoga 730 and have about 260 GB of storage, but now have 0 MG left lol. What makes me really confused that even after uninstalling Adobe Photoshop and a game (freeing up about 10 GB), my storage is completely full the next day. When I go to uninstall programs these application they show up as taking up way less storage. I have not downloaded a single thing. I have just been doing day-to-day tasks. I am completely awful at technology. My boyfriend tells me I should just buy a 1 TB external drive.