Here's an easy first project for a new bitcoin dev: make a "server explorer" for the various types of servers in bitcoin Electrum servers, lightning nodes, and bitcoin nodes are all common servers that wallets and exchanges interact with. Lightning explorers are already very common (e.g.

The Mempool Open Source Project®

Explore the full Bitcoin ecosystem with The Mempool Open Source Project®. See the real-time status of your transactions, get network info, and more.

and this electrum server explorer already exists:

Bitcoin All Seeing Eye

But it isn't very pretty, and I'm not aware of anything similar for exploring bitcoin nodes and their features. Someone should make one that is beautiful and fun!