conflict

what_they_dont_teach_you_in_mfa_programs_how_to_write_stories_chris_mooney
Plot

What They Don't Teach You in MFA Programs: 5 Rules for Writing Stories That Work

Conflict is what drives a story. Without opposition, the story becomes lifeless. Learn the four types of conflict and how to effectively use them in your next screenplay.
Screenwriting (Film)

Script Classics: Conflict at the Core—Four Types of Conflict

reilly
There Are No Rules Blog by the Editors of Writer's Digest

Writing the Unlikable Character (and Why You Should)