face vertices causing weird indention in model I'm a newbie when it comes to blender so I started making my first model, when I render it smooth a weird indention forms near the bottom where a face intersects, how do I get rid of this?

Link to the blend file:
If we take a look at the inner topology, here is what we can see (below). You have inner faces, i.e. edges that are common to more than 2 faces, it is not good because when you'll try to smooth it, it will tend to create artifacts as it will try to smooth with all these inner faces as well, so select all these faces and delete.: