There are a bunch of ways clients might handle their Web of Trust (WoT), and I guess the simplest / straightforward one is:
if you set up your WoT at 0, then it would show only posts from people who haven't had any of the people you follow mute them.
If it's set at 1 or 2, it would show posts from people you have been followed by at least 1 or 2 people you follow.
If it's set at -1 or -2 then it would show posts from people that have been muted by 1 or 2 of the people you follow.
Gist: You don't see posts from behind the number you set.
Even though it's the basic/simplest version of WoT, it still might be confusing to people or hard to grasp, so I thought I'd quickly make an interactive visualizer for it.
Hope it helps in understanding it! (this is basically the same of what's on coracle.social) :
https://freakoverse.github.io/wotonnostr/