You have probably bought a course, watched two lessons, and never opened it again. That is not a failure of willpower, it is usually a mismatch between what you need and what the course delivers.
Online courses are worth it when they solve a specific, immediate problem. If you need to pass a certification, land a new role, or finish a project, a focused course pays for itself quickly.
Where they fall flat is when you buy on impulse. A shiny landing page and a discount timer are not reasons to spend. Ask yourself what exact skill the course covers and whether you will use it within a month.
Check the instructor, the refund window, and a sample lesson before paying. A good course has a clear outcome, not just a long syllabus. Pick the problem first, then the course. That is the order that actually saves you money.