Taking community college courses the summer before attending Cal—Help?

I’ll be attending UC Berkeley this fall. Before that, I’d like to take a Math 1B equivalent over the summer at my local community college (it’s in the Los Angeles Community College District). The CC does not distinguish between somebody just taking a summer course and somebody attending in the fall; they’re the same application, and you have to take the same assessment test to get in, you have to register with the CC, etc.
I’ve heard some horror stories about students’ statuses at their universities changing from freshman to transfer (not for Cal specifically) because they took too many community college courses over the summers or something, and I wanted to make sure that it wouldn’t happen to me.
Thank you for any information that you can give.

I’ve actually never heard that before… But then again, I don’t know a huge number of people. Have you been taking CC courses before this summer?

No, I’ve never taken a community college course for any reason.