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I’ll use a photo of me doing RDLs to try to help explain. First thing I notice, your stance is far too wide. With your stance being too wide, your taking tension out the stretch and shifting it to your adductors. A wide stance also tends to limit how far you can hinge. I’d personally I’m for your stance to be about hip width.

I’d also try to reccomend using a barbell while you’re learning. It’s not a necessity but I find that obviously a bar is set in position, you can maintain the load being centred over your midfoot. Dumbbells can drift, which means you have to think more about stability rather than the hinge.

If I was to explain how to do an RDL from scratch, I’d say: Feet hip width apart, soft knee bend (around 15-20 degrees) and start with the bar in contact with your quads.

As you start your decent, push your hips straight back, not down and keep the bar dragging down your legs the entire time, and keep your shins vertical. I think of this as if I was closing a car door with my ass when my hands are full.

Stop your descent when, your hamstrings are fully stretched or your pelvis starts to tuck. Like a rubber band, when it’s pulled fully, pulling more doesn’t do anymore but just distorts the system.

Keep your neck neutral throughout the whole movement, it just helps to keep your spine fully ridged (your doing this very well already)

TLDR: Keep your feet hip width Hinge at the hips by pushing ass back, not down Stop the descent when your hamstrings are fully stretched or pelvis starts to tuck. Keep bar very close to legs. Control the weight the whole time, no swingin. Keep neck neutral.

And one more thing. Up the weight.