If I'm on a server and I post something and someone (who is from other server) comments on my post does rules of server where I am apply to that comment?
Yes, your local instance's rules apply to content they host.
The rules/decisions of other instances (even uninvolved ones) also apply where the other instance has a sufficient population of users or sufficient influence such that if that instance bans your local instance, you would be disconnected from the majority of users.
I want strict rules and moderation especially in LGBTQ+ topics. I left Twitter because I'm a trans woman and I don't want to use a platform where any form of transphobia etc. is allowed.
Most of the fediverse strictly prohibits transphobia.
I will follow many topics and people. I will want to see news and politics but also memes and hobbies (trans and pc/linux memes but also other techonology/pc/linux posts).
Yes, your local instance's rules apply to content they host.
The rules/decisions of other instances (even uninvolved ones) also apply where the other instance has a sufficient population of users or sufficient influence such that if that instance bans your local instance, you would be disconnected from the majority of users.
Most of the fediverse strictly prohibits transphobia.
This is most of Mastodon.