I would recommend installing fish and just launching it in your terminal (just run ‘fish’), to play around with it.

Fish has a lot of convenience features set up / enabled by default, so you can get a good impression of what’s possible without too much trouble setting it up.

You may prefer going with zsh + oh-my-zsh for the long-term, as fish’s syntax is only similar to bash, not entirely compatible with it (they actually try to improve on it), and zsh is striving for bash compatibility, it’s just more work to get it set up with all of the features.