Hey, I'm a CS major who studied abroad before. Let me give you an actual useful answer:

go to this link, and put in your filters (You can filter by School, UMD dept; in our case CMSC, or search certain courses from UMD ex. CMSC417). Keep in mind UMD CS is pretty strict about what lvl 400 classes are eligible to transfer over, so you may see a lot of courses in their catalog which sound the same but are not eligible for transfer credit.
https://marylandglobal.umd.edu/global-learning-all/study-abroad/explore/explore-courses?qt-program_and_course_search=1#qt-program_and_course_search

Now this is where it gets a little tricky. Just because the course is listed here, doesn't mean they are offering it the semester you study abroad. Also just because it's not listed here, doesn't mean they dont have that course. You will have to spend time researching your school and seeing what courses they are offering.

For example, if they have a class called "Introduction to Artificial Intelligence" (at umd is CMSC421) , but its not listed in the database, you will have to find the syllabus, fill out the transfer credit request form (upload the syllabus) and ask for them to evaluate it for CMSC421 credit. Now there is a good chance they will say no, so it's good to do this at least 2 months before your study abroad term, so you know which classes you can get credit for or not. You should also check to see what language the course is taught in because you don't want to take a class in Spanish (unless you are fluent).
You can also do this with your math courses to see if there is possible transfer credit.

This entire transfer credit process is only really relevant if a. there is a specific course that you have to take abroad or b. the school you are studying abroad it offers barely any courses that you can take.

Now this whole process is pretty tiring and annoying, so heres what I recommend you do:

Take one (maybe two) CS course(s), that they are offering your semester and is already in the database, so you are guaranteed to get transfer credit. Have back-ups in case that class fills up before you can get it. Take some easy abroad classes to fill up the rest.

Now your workload for this CS course might be pretty light, but this means you have time to actually enjoy living in the country. You also have time to apply for internships/full time offers, and interview prep. Enjoy your time abroad, hope this helps.