A "complete curriculum" covers every subject for a grade level in one connected program, with a set daily or weekly schedule — good if you want a clear plan to follow without stitching pieces together yourself. A "unit study" approach organizes learning around a theme (say, ancient Egypt) and pulls in reading, writing, and history together — good for kids who engage better with connected projects than isolated subjects. "Subject-specific" resources (a strong free math program, a separate reading program) let you mix and match — more flexible, but it's on you to make sure nothing's missing.
A rigid, highly-scheduled complete curriculum can feel like relief for a family that wants less daily decision-making — or like a straitjacket for a kid who needs to follow their own pace and curiosity. There's no universally "better" structure; the honest test is whether your kid is engaged and whether you can realistically keep up with the schedule it assumes.
Some programs are fully free forever (open educational resources, nonprofit-funded courses). Others are free at younger grades and become paid later, or free for the core lessons but charge for printed workbooks, answer keys, or grading tools. Read the fine print on any "free curriculum" before building your year around it, so you're not caught mid-year needing to pay or switch.
Most curricula (free or paid) don't fully replace things like state-required testing, portfolio review, or registration paperwork — those are handled separately through your local homeschool laws. A strong curriculum makes the teaching easier; it doesn't remove the administrative side.
We've put together a short list of genuinely free, verified resources across complete curriculum, classical, and subject-specific options — see the Free Homeschool Curriculum page for the full rundown.