Here’s a quick tip for beginners; Gains end where egos start! Don’t worry about lifting heavy, just focus on feeling every single rep.
At first I would recommend a weight that’s light enough for you to be able to stop the motion at any time. Really squeeze the muscle and leave momentum out of it! You can worry about cheat reps and going heavy later, but if you haven’t developed a functioning mind-muscle connection first then you’re not gonna receive any of the benefits from it!