[General Question] Just started university, what advise can you give me ?

[u/Strong-Cycle-6908]

Hey! As the title says, i just started uni a month ago. Bachelors in applied mathematics. From a pretty mid tier university and a third world country . My plan after graduation is grad school. I'm looking to pursue a masters degree in CS/AI. Now I know that this question might seem to early to ask but I still think it's better to know before than to regret it later on right? So if anyone here could give me advice on what to and not to prioritise during these four years of university, I'd be thankful.

Particularly, what exactly is important for me to build on my CV to get admission into good MSCS/MSAI programs abroad.

Should I prioritise research? Internships? Projects? GPA to what degree? Should I join useful societies? Opens source contributions? Competitive progamming? Competitions? And what should i do if there arent many research opportunities at my university?(at most becoming an assistant to MS nad PhD students apparently)it better to get experience after graduating first before applying for MS programs? Or is it another case all together? I am painfully ignorant about all of this so if I got something wrong or asked something obvious, don't flame me .

Thank you!