Many of us, have read GM-sections in RPG, RPG blogs, forum discussions, and sometimes books about the storytelling art.
All of these contains tons of interesting tips/techniques (and some will contradict each other, you don’t GM a gritty mega-dungeon and high-school drama game the same way), so I am curious which ones are your favourite and how do you use them in your game
Read George Polti’s The 36 Dramatic Situations. It’s a list of plot elements that have a snappy title, a list of participants in the plot element, a brief discussion of how it works, and then (unfortunately dated) references to dramas that used them.
Using this when building a world, or a campaign, or a local setting, lets you quickly set up a bunch of conflicts (ideally with interlaced participants so that single NPCs (or PCs) can be in different roles in different dramatic situations. Then you just let the events flow logically, and as the dramatic situations get resolved you get a plot. PCs can interfere with these dramatic situations and thus have an impact on resulting plots even if the overall setting is far larger than they are.