Lots of supportive great advice here. My only two adds here are:
- there is actually a guidebook for biking safely. Very much similar to a driver manual. The SoCal Bike Associative used to have it posted years ago but look that up and give it a read.
- find a local recreational biking group on your region and ride with them. There should be one that's beginner friendly. If you can't find one immediately look for a bike build community. We have a few in my city. One called Bike Kitchen. They teach you how to repair your bike and introduce you to other new riders and experts who love teaching.