Biggest protocol things people are excited about are [Ark](https://ark-protocol.org/) and [BitVM](https://bitvm.org/).

- https://bitcoinops.org/
- https://delvingbitcoin.org/
- https://bitcoinsearch.xyz/
- https://groups.google.com/g/bitcoindev

k00b

>I'm coming back to the Bitcoin space after a couple of years focusing on other aspects of my career and life.

Giving up on Bitcoin is lame. You never stop learning about Bitcoin and if you stop ... you are fucked.

DarthCoin

utreexo
whatever helps lightning scale 
consensus cleanup

standardcrypto

bitcoin

Hi guys,

I'm coming back to the Bitcoin space after a couple of years focusing on other aspects of my career and life. In the past I worked as an independent technology researcher, and I'd like to get back to the game and research current technical developments happening around Bitcoin. What's hot and promising nowadays?
My last spots were RGB and bitcoin defi through DLCs, but those are from ~2 years ago. Can you recommend topics and online resources to dive into them? Thanks!