It's actually not that complicated:
1. Fly up to your subject.
2. Check for obstacles all around your path.
3. Use right stick to get drone moving sideways. I hook a finger around the stick to keep it steady.
4. Use left stick to keep camera pointed at subject. It's just like flying normally, if the target is moving to the left, you would yaw a little more to the left.
5-5299. Practice Practice Practice
My failure is always in attention spa -- where were we?
The mental thing is, you're moving the sticks in opposite directions.