If you're looking to choose a new set of reference / studio monitors available now (2020) this video from Consordini Musical instruments is a good video to check out.
First off, Alan gives a very brief overview of the reason why mixing your tracks using flat EQ reference monitors is preferable over consumer-grade speakers. Check out these videos by Joe Albano If you want to go deeper into the mixing process.
Let's say you're ready to spend some money and buy your first studio monitors but you want a concise review of nine of the best budget options... you've come to the right place.
Here's the nine monitors that are compared and contrasted in this video.
The only thing missing from the review is the price at the time of shooting which is a minor inconvenience only.
Remember, while it's all well and good to have an accurate, flat pair of studio monitors, it's even more important to understand the acoustics of the room you're mixing in, and therefore understanding how to set up your monitors to get the most out of them. You can learn all this and so many more essential tips in this video course on Acoustics and Studio Design by Joe Albano.