Gym Brace Protector
If you are fairly new to weightlifting, I wouldn’t spend the money on sleeves
Simply put, there isn’t enough pressure bearing down on your knees to require their use. But again, that is all relative to your age, athletic background, and more than anything else, form and technique. Poor training or technique can be disastrous in and of itself, so to help retrain the proper muscles might require a little “support.” Otherwise, after a year or so of lifting sleeves might be helpful, but only for the portion of your workout that involves the knees.
I do encourage the use of sleeves for all intermediate to advanced lifters as the support that they provide really does help hold the entire knee in place and thus prevents injury.
Simply put, technique + proper equipment = proper strength and efficiency long-term.