How to check bags for cheap?

Hello there, I'm curious to know how one can go about checking bags for cheap? I've heard that airlines often charge hefty fees for baggage, so I'm wondering if there are any strategies or tips that you might have to help me keep my travel costs down. Are there certain airlines that offer more affordable baggage options? Or perhaps there are certain times of the year when bag fees are lower? I'd love to hear your thoughts on this and any other advice you might have to help me save money on baggage fees. Thanks in advance!