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How to DM resources?
(ttrpg.network)
A place where Game Masters, Dungeon Masters, Storytellers, Narrators, Referees (and etc) can gather and ask questions. Uncertain of where to take the story? Want to spice up your big baddie? Encounters? That player? Ask away!
And if you have questions about becoming a Game Master you are most welcome with those as well!
Rules
It looks incredibly basic and difficult to incorporate into prep or play. It seems to be for people without experience.
Berin Kinsman has a nice set of books on gamemastering. He does have a bit of a minimalist writing style. The books have some good advice that isn't commonly discussed.
Robin Law's gamemastering book is a pretty good starting point.
The Alexandian is also good, but I have some style disagreements with him.
The old WEG starwars guide is very good for the basics.
Cthulhu d20 has a pretty good section on presenting a more thrilling game and horror.
Overall there is not a whole lot of great advice in the hobby. Most of it is the same bland or unactionable advice.