Abbie Emmons: A published author. Her videos have great tips and advice for plot and character development.
Hello Future Me: Mostly worldbuilding tips, but very in-depth, with specific examples.
Ellen Brock: A professional freelance editor who provides help with all aspects of writing—outlining, worldbuilding, character writing, plot development, publishing, and generally answering any questions writers may have.
Terrible Writing Advice: Great writing advice, if you can handle the sarcasm.
Writing Excuses: Albeit fast-paced, the given writing advice is quite useful. There's multiple seasons addressing topics such as story structure, characters, and genres, amongst many others.
The Creative Penn: This podcast is run by author Joanna Penn, who shares the lessons she learned in her own journey and advice for writing and publishing your novel.
I Should Be Writing: Interviews with various authors, and encouragement for aspiring writers.
Story Grid: Outlining methods, writing tips, editing advice, and analysis of various works.
Creativity Portal: Author interviews, creativity generators, writing prompts and templates, and various other writing resources.
Now Novel: Aside from writing tools, this website has multitudes of posts about characters, dialogue, narration, plotting, editing, and story structure, as well as writer motivation.
Helping Writers Become Authors: Tips on dialogue, characterisation, outlining, plot development, structuring, character arcs, and common writing mistakes to avoid.
Almost an Author: This website is great help for aspiring authors, with advice that ranges from genres to motivation for writers to guidance for making writing a career.
Hope this is helpful! I'd love to hear any other resources you use or are familiar with. Happy writing ❤