Can I learn both Tehrani and Dari Persian at the same time, or will that break my brain?

I’m an absolute beginner who keeps bouncing between apps, but I’ve realized my materials are all mixing Tehrani (Iran) and Dari (Afghanistan) vocabulary and intonation. I want to focus on one so I can actually reach fluency, but I don't know which one is better for a total beginner who just wants to read literature and communicate safely. Should I commit to one script/pronunciation set, or does it not matter that much yet?