Weightroom

I like this one - Israetel isn't always my favorite, but he does strike me as extremely knowledgeable and with a sincere commitment to avoid the flood of pseudoscience that is the plague of the industry.

Be aware - this link isn't just the form cues, but if you follow each muscle group link, within each sub-article is a table with links to zero-fluff 30 second YouTube videos demonstrating form for a huge number of exercises. Cool shit.

Link: https://rpstrength.com/blogs/articles/complete-hypertrophy-training-guide#training

I use the hevy app, it has animations and instructions that look very similar:

Previously, I've just done a web image search to find a diagram of the motion, and then practice that enough times to commit it to memory. But for introducing new exercises, that's a nice resource there, all in one place.

For form checks, I set up a tripod and have my phone record the motion, then pass the video to my weightlifting friends for their opinions. I'm aware that doing this in a commercial gym might look like I'm filming an Instagram video, but: 1) gainz come first, and 2) homegym lol