Doubt file upload location

I’m having the same touble of this thread:

I don’t know why noone replied to that, but maybe it was in the wrong place and I haven’t found any other topic like this.

My backend(admin) has an image upload that are accessible in frontend as well.

What is the location of the folder I should upload the images into?

In the ‘basic’ structure they say it needs to go on the web folder, but in the advanced I have 2 web folders.

What’s the best solution to this problem?