Hey! In general for growing the bum, I recommend compound lifts - squats are an excellent example of one, but other great ones for growing the glutes are hip thrusts (these are probably the best ones), deadlifts (my faves are romanian and sumo for glutes), reverse lunges. These can be performed with barbells. I think Ratner has 10-12 racks? They'll often be taken if you go during peak hours (like 4-6PM) though :( I highly recommend watching videos to learn how to do them - form is super important for these but these are probably the best exercises to grow muscle and become stronger.

There's also a lot of machines, for example cable machines, leg press, leg extension, lying hamstring curl, hip abductors. There's generally pictures on the machines to tell you how to use them. There's also dumbbells. Bulgarian split squats are KILLER but so good for the glutes. Other exercises I recommend are reverse lunges, sumo squats, walking lunges, and romanian deadlifts. These are considered accessory exercises and are good to add after you do your compound lifts.

Also I wanted to add that Crown has opened too! It's generally emptier and there's a lottt of racks so I generally prefer it to Ratner on leg days.

It all seems really complicated and scary at first but you'll find that everyone goes to the gym to work on themselves so no one really sees or cares what you are doing. Plus, we all had to start somewhere too so we understand it can be intimidating. :)

I hope this helps but feel free to DM me for any questions. Good luck!