Open D is such a loud ringing and rich tuning to play in. I can never get enough of it. Once you learn beyond the 1-4-5 basics and some other chords be they minor or major you can site for hours just improvising and exploring open D. I just teach some basic chords and licks in this video for Open D Tuning.
There are so many different types of music that use open D tuning to great effect. In this video I go through all the basics to get up and running and composing quickly, because composing has to be one of the funnest things to do in this tuning.
Remember in the beginning if you are a beginner that it takes time and practice. It all sounds mechanical in the beginning for anyone just starting out.
Just keep banging away at it. If you love Blues stuff then give “Blind Willie Johnson” a listen. His voice was really gravely and some people don’t like it but his slide playing in open D was really spooky sounding. He probably had the best vibrato in this tuning I ever heard.
Just have fun.