NEWBIE PROBLEM MOST FACE MAYBE

I want to make an social media type App for my school friends to connect with and like a place where people can create study groups of the college and hold events customizable for every schools i can do basic react native for the front end but i am really new to backend and real project stuffs i tried firebase but as the storage for the pictures was paid i dropped learning it and i see myself drawing too much from one to other and cant focus on one . I hear a lot of you tube coders telling you don't need to learn syntax so that puts me to a verge thinking then what to learn ? what to use Ai on i am confused and would be grateful to any experienced developer who guide me . Thanks for viewing this and have a good day ahead .