Villains need to be interesting just like any other character. We need to know what they are doing, their hopes and dreams too so they're not one note. Just think about what I call the Mirror Mirror effect. From what I can see, most actors are all too excited to play their character going evil (or slutty). Just think about Spock, Sulu and Uhura. I swear the actors had way more fun with the Mirrorverse characters than they ever did with their normal personas.
You can see that again with Spike and Angel. It's obvious David and James had much more fun with their characters when they got to be swaggering evil. Even Tom Payne really threw himself into losing his mind/might kill someone Malcolm in the sex dungeon (speaking of which seriously getting to do something super sexual, just witness Daniel Radcliff doing his Franken Furter homage in Miracle Workers).
But their evil needs a basis. Can people be evil just to be evil? Hell yes (watch true crime) but the fictionalized villains usually need a motive or we're left asking why (okay we're often left doing that in the real world too but there we expect no answers)
have some links from around the world
Make Inroads Into The Homeschool Market The Seven Steps Of Book Sales To Non-Retail Buyers. Increase Book Sales By Asking The Right Questions What Does It Mean To “Write What You Know? How To Sell Books Through Gift Shops In Parks How To Harness The Hidden Influence Of Power Words Updated: Authors & Editors That Can Touch Up Your Manuscript & Query Letter. (honestly not how I thought he'd sound)
Something I desperately need to do
From Betty
https://writersinthestormblog.com/2021/09/writing-spies-how-to-bug-a-room/ 6 Tips to Make Your Scenes Visually Dynamic I need to read this a few times
A Layered Method for Creating Consistent CharactersAnatomy of a Meet Cute Writers, Do You Struggle with the Learning Curve? The Three Traits of Annoying Characters Seven Tips for Receiving Feedback Why You Shouldn’t Write a Masterpiece Story Not Behaving? Try Going Deeper into StructureChoosing Your Fiction Genre: The 3 Things You Should Consider First