Nostr is easy....just connect to Relays you feel called to connect to and find the clients that gives you a good experience. I use Nostrudel.ninja and Yakihonne on desctop and Damus on my phone.

Here are some good sites to get more into Nostr:

https://nostrapps.com/

Thanks for being here and connecting 💚

Mastodon is not decentralized...it's a social media platform, that connects to Nostr as well... but most people on mastodon do not interact on Nostr, but you can see their profile and posts on Nostr...