What's a Good Software Stack for Building a Social Media Platform for Multimedia Curation?

I'm looking to build a social platform focused on sharing multimedia content like images, GIFs, and videos, with collaborative curation features like tagging, collections, searching, downloading, etc.

Essentially the goal is to make it really easy to post, organize, discover, and collect multimedia content. I envision a mix between booru-style imageboards, Internet Archive and Lemmy.

I'm looking to use this as a learning project to get more hands-on fullstack and devops experience.

What would you all recommend technology-wise for someone starting out? I have some Python and web dev basics down, but not enough to feel comfortable just jumping into a big project.

Ideally I'd like something with good documentation/tutorials and an active community I can turn to when stuck.

Would love any suggestions on stacks to look into or good starter tutorials/books related to making the jump to a large project like this.

Thanks for any advice!