A good college list is the most useful thing you can build before you apply, and it's free. The goal isn't to chase the most famous names. It's a set of schools where you'd be happy, could be admitted, and can afford to attend.
What reach, target, and safety actually mean
A reach is a school where admission is a long shot even for strong applicants, or where your numbers sit below the typical admitted student. A target is a school where your grades and test scores fall within the middle range of admitted students. A safety is a school where your profile is comfortably above the typical admitted student, you're confident of admission, and you could pay for it.
Very selective schools, those with single-digit acceptance rates, are reaches for nearly everyone, however strong the application. Treat them that way.
Use real numbers, not rankings
Every college's Common Data Set (search "[college name] Common Data Set") lists its actual admission rate, GPA and test-score ranges, and how heavily it weighs different factors. Compare your own numbers to those ranges. Edufy's college directory also shows federal acceptance-rate data for each school, which is a quick first filter before you dig into the details.
Build in this order
Start with your safeties. Pick schools you'd genuinely enjoy and know you can afford, since this is the part students most often skip. Then add targets, which should make up most of your list. Finally, add a small number of reaches. Counselors often suggest somewhere around six to ten applications in total, but the right number depends on your situation and your application workload.
Check cost for every school with its net price calculator, which every college is required to provide on its website. Sticker price and what you'd actually pay can be far apart, and so can the aid you'd qualify for.
Check fit, not just odds
Look at the programs you care about, class sizes, location, campus culture, and support services. A school you'd be unhappy at isn't a safety, even if you'd get in. If you'd rather not attend it, take it off the list.
The honest bottom line
A balanced list protects you from the two most common mistakes: applying only to long shots, and applying only to schools you don't actually want. Build it from real data, revisit it as your grades and test scores change, and make sure every school on it is one you'd be glad to attend.