Some Steam Deck starter resources

Player Lounge Portable Gaming
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  1. Proton DB - check here for all your compatibility stats: https://www.protondb.com/
  2. Deck Central - news and info: https://deckcentral.net/
  3. Boiling Steam - steam news in general, lots of Deck stuff: https://boilingsteam.com/
  4. FlatHub - linux flatpak apps. Preinstalled on Deck under Discover: Flathub—An app store and build service for Linux
  5. RetroDeck one of the better retro setups for the Deck: https://retrodeck.net/
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@Supherbyus found a cool site with loads of Steam Deck startup videos:

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Another great @Supherbyus find - and I believe @danvandam uses this one too: