There's a marketplace? Whoa.
When it comes to Nostr, Amethyst is hands down, the best client. There is no second best.
Things you can do on Amethyst:
1. Custom Emoji Replies 
2. Marketplace Listings (sell stuff to a global market) 
3. Video Browser for TikTok style content 
4. Zapraisers (bitcoin fundraising posts) 
5. Split and forward Zaps to other relevant people on your posts 
6. Edit your posts and view other peoples' edits and corrections https://video.nostr.build/e637d496adfc0c0d19632e012b92c2529681ba85fa12f752ab4332845fa5d8d9.mp4
Discussion
Yes it's really amazing. I saw someone selling their old phone on here just yesterday!