take few wild chances riding in the first few months. don't goof around too much while riding. get all the basics down. test your abilities and agility in safe areas to improve your riding.
my first year or two riding again as an adult resulted in three crashes. they're always jarring and have a lasting impact both mentally and physically. they all could have been avoided. i was either goofing around, not careful in busy areas, or was indecisive.
you can go fast and have fun and still be careful.
safety is key. every time you get on the bike, ensure ...
- the tires are inflated to a reasonable pressure as written on their sidewall
- the wheel axles are locked securely in the fork
- the brake levers provide the proper leverage to apply the pads.
there's just too much to say in one post. bon chance.