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Find a category for what you want to post and look for relevant communities or create one.
Example: A link to metal music could go into !metal@lemmy.world, there are also communities for more or less specific categories, ie !death_metal@lemmy.world or !music@sopuli.xyz.
No, votes should not be displayed public.
Blocking those who downvote creates further polarisation, echo chambers and an environment more hostile to discussion and honest exchange.
Following those who upvote creates personality cults and nepotism and devalues the content.