What is a good GPA?
In the US, GPA runs on a 4.0 scale, and 3.5 or higher is generally seen as good. A 3.0 is solid and still keeps plenty of doors open. There's no single magic number though. What counts as good depends on your major, the scholarships you want, and whether you're aiming for grad school.
The 4.0 scale is the standard. An A is a 4.0, a B is a 3.0, a C is a 2.0, and so on. Your GPA is just the average of all those, weighted by how many credits each class is worth. Most people land somewhere between 2.5 and 3.8.
Context matters more than the raw number. A 3.4 in a hard major like engineering can look better than a 3.8 in an easier one. Lots of merit scholarships ask for 3.0 to 3.5 as a floor, and competitive grad programs often want 3.5 and up. So a good GPA is really the one that gets you where you want to go.
One thing that trips people up: weighted vs unweighted. An unweighted GPA caps at 4.0, while a weighted GPA can go past it because honors and AP classes are scored higher, so the same grades can show up as two different numbers.