There are quite a few different versions and alternate realities of Spider-Man in the comics. It's hard to give an exact number, but there are definitely more than a dozen.
There are quite a few. Different storylines and universes introduce various versions of Spider-Man. Some notable ones include Peter Parker, Miles Morales, and Ben Reilly.
I'm not sure specifically as I haven't read it. But generally, it might be about complex relationships where lies and love are intertwined. It could be about characters who get caught up in a mess of falsehoods while also experiencing love in different forms, like romantic love or the love between friends or family that is affected by the lies.
In science fiction, a 'tangled web' might deceive through complex illusions. For example, advanced alien species could create a web of false perceptions to mislead humans. They might use technology to distort reality, making things seem one way when they are actually another.
Since I'm not familiar with this novel, the main characters could be a group of friends. One of them might be a compulsive liar, and the others have to deal with the consequences of those lies while also dealing with their own love lives. For example, one friend could be in love with the liar's sibling, which makes the situation even more complicated.
One common form is through false appearances. In many science - fiction stories, robots or androids might be made to look like humans. This is a form of a tangled web of deception as it misleads other characters into thinking they are interacting with a real human.
Well, an omnibus in the world of comics is basically a single book that brings together a bunch of separate comic issues or volumes. It makes it convenient for readers to have a chunk of related content in one place. It can save you from having to hunt down individual issues.