There are multiple ways to find a good professor. These can include: asking current students in the same major as you, reviewing their course evaluations online or sitting in on a class that they're teaching to see how you like their style. As someone else mentioned, you can also speak to your student advisor to get a feel for how the professor is.
You can find a great Professr by searching them on rate my professor. I’ve used this website to find all my college professors which has saved me tons of time and money. It’s a rating/opinion based website where students write their experience in a professors class, how they grade, etc. You can also ask peers, or classmates who have taken the course before to get their perspective. Another option is to email the professor, or set up an appointment during office hours to get an idea before you choose to add their class. This way is helpful because as you get to know them for yourself to see what kind of professor they are and decide if they are a great professor.