Please explain I'm so confused!

In terms of growing muscle mass, can you use the same weights but increase reps instead of increasing weights? (progressive overload)

I heard you can use the same weights but just increase reps to get the same results instead of increasing the weight but I also heard that was complete bullshit.

For context I workout at home, I went to the gym before but I didn't really like it. I have weights and benches but adding on weight is getting expensive ^^"

(trying to increase lower body mass)

Can someone clarify?