studiobinder.com
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StudioBinder is a film production management platform that also offers educational resources, including articles and guides on storytelling, screenwriting, and character development, such as character arcs.
More resources on Character Arcs
screencraft.org
Screencraft.org is a screenwriting resource hub offering craft-focused articles, tutorials, and expert insights on character arcs, plot, and screenplay development. It also features industry interviews and information about screenplay contests and opportunities for writers.
The Art of Dramatic Writing
The Art of Dramatic Writing - A book resource
scriptmag.com
Script Magazine is a trade publication for screenwriters. It features craft-focused articles, interviews, and tutorials on character development, arcs, story structure, dialogue, and other screenplay techniques, plus industry news and resources.