Phone says storage is full but won't let me delete anything

I don't even know where to start the issues with this phone, which is an iPhone X that I got about a year ago. First, it always pops up the "iPhone Storage is Full" all of the time and whenever I go to delete some of the very few things I have on this phone, whatever I delete ends up popping back up. For example, I'll go to delete some images and videos and then when I go back a few minutes later to delete more things because the phone still isn't working, the images and videos I had deleted are there again after they had been deleted and I have done this multiple times and I know that I am deleting these images (the correct way.) Another issue with this phone is that while I am on it and in an app it will randomly crash or not load anything, I don't understand how the lack of storage available can make the phone have as many issues that it does. I think Apple has great products which is why I continue to buy Apple products, however, the issues I have had make simple tasks very difficult and increases the amount of time I spend on my phone just to fix it. I know everything has it's issues, but the phone literally does not work and doesn't function.