At this point, I suggest not overwhelming yourself with too much, like body-positioning and trail-braking. That’s racing stuff for later after you’ve mastered the basics.
- starting & stopping smoothly (remember the egg, or a passenger you don’t want to jostle too much)
- shifting promptly and smoothly with rev-matching up & down (blipping)
- managing traffic
- bike-control, making bike track exact line on road you want
- etc.
And have fun!!!