Q.What Techniques Can I Learn To Enhance The Health/ Growth Of My Plants ?
What techniques can I learn to enhance the health/ growth of my plants ?

Certified GKH Gardening Expert
This will depend on the plant, really. Every plant has its own needs, and sometimes these needs are unique. I would say that thorough research of each plant will be the first thing to consider. Speaking of, you can find many videos and articles to help you with gardening here:
https://www.gardeningknowhow.com/tag/gardening-videos
These articles will offer some advice, as well:
https://www.gardeningknowhow.com/garden-how-to/info/beginner-garden-tips.htm
https://www.gardeningknowhow.com/garden-how-to/info/garden-tips-from-the-past.htm