- Proton DB - check here for all your compatibility stats: https://www.protondb.com/
- Deck Central - news and info: https://deckcentral.net/
- Boiling Steam - steam news in general, lots of Deck stuff: https://boilingsteam.com/
- FlatHub - linux flatpak apps. Preinstalled on Deck under Discover: Flathub - Apps for Linux
- RetroDeck one of the better retro setups for the Deck: https://retrodeck.net/
@Supherbyus found a cool site with loads of Steam Deck startup videos:
Another great @Supherbyus find - and I believe @danvandam uses this one too: