I'm into my 3rd month with the double bass, and felt I should start compiling the resources that I've discovered online that have been incredibly educational to me.
- Basic right hand tone production by Chris Fitzgerald
- Incredibly Useful Exercises - has a huge list of videos on arco
- Paul Thompson runs a channel called pdbass filled with incredibly useful videos
- Discover double bass was where I started (Geoff's beginner course)
Additional resources that relate to music in general