I searched for a topic that explains this but i didn't find anything. So can someone explain how the trust settings work?
I can give it a shot.
I know i'm on default trust, i'm not sure who sat me on it.
Profile -> Trust -> Trust Settings -> Hierarchical view (at the bottom) -> search for your name -> turns out you are escrow.ms's list.
When i rate someone then this rating is visible for everyone.
Yes and it influences their overal trust score, unless someone explicitly removed you or escrow.ms from their list.
Does my rating change the trust lists i have?
No.
Then, in trust settings you see a list with depths and names. And you can enter usernames with a trust depth level.
So can i set someone on default trust when iam on default trust?
Depends. The default depth is level 2 thus only those on level 1 can add people to the trust network as most people will see it.
If not, is when i set someone on level 0 default trust that this person is most trusted? Level 4 is trusted?
Level 0 for you is your personal list, its those that you put on your list. By default thats only the user "DefaultTrust". Level 4 is only considered trusted if you change the settings accordingly.
I would like to know what the consequences would be when i play around with these settings.
For others? None.
For you, depends on the changes. Increasing the level will add a high amount of people. Adding people to the list while keeping the depth on level 2 will not only set those people (lvl 0) on the list, but also those on their list (lvl1) and those (lvl2) on the list of those (lvl1) on the list of the person (lvl0) you added to your list.
-snip-
Default Trust ist Level 1? Only theymos is level 0?
Theymos is on level 1. DefaultTrust is on 0
Though when i set people on trust levels like 1 or so, then this means i will see their ratings the same way like i will see the ratings of everyone on default trust.
But what i wonder, when i set people on higher trust levels, does it matter to others does it matter only to me who is seeing the trust ratings those persons gave with higher importance than before?
You can not set people on a specific level. You can set people on your list or explicitly remove people from your list (e.g. ~shorena will remove all my ratings no matter why I show up in your personal trust network). You can also set the depth, but its the same for everyone on your list.
As long as you are not on the trust list of the account "DefaultTrust" and thus end up on most peoples list on level 1 your personal list does not matter for most other people. The exception are those that increased the depth.
No offence taken. Youre right... i only now checked the trust settings out. The thing is that it, at the moment, really only makes much sense when you are on default trust level one and having a trust list. Without that it is only affecting your personal view of ratings and that mostly is not needed because the ratings from people on default trust level 1 and 2 are mostly correct. We know exceptions of course. 
