question about manual controls

I’m pretty new to photography on a camera, and right now I usually shoot fully manual, I control ISO, aperture, and shutter speed myself.

But I’ve noticed a lot of people leave one of those on Auto, and now I’m wondering if I’m making things harder for myself for no reason.

Is it better to shoot fully manual as a beginner, or is it smarter to leave one setting on Auto?

If so, which one do you usually leave on Auto (ISO, shutter speed, or aperture)?, in what situations?,

and why?

I mostly want to learn properly, but also not miss shots because I’m overthinking settings.

Would appreciate beginner-friendly explanations.