How do I find a good amp?

Hey there, I'm on the hunt for a great amplifier but I'm not sure where to start. Can you offer some advice on how to find a good amp that suits my needs? Are there certain features I should be looking for? Are there any brands that are known for their quality? Additionally, how important is it to try out an amp before buying it? I'd really appreciate any guidance you can provide to help me make an informed decision.