Repotting flower plants

I tried repotting flowers from one pot to another but they die.  I am doing something wrong. How can I repot flower plants from one pot to another.  What soils and other items do I need and is there a certain size flower pot I have to repot them in or does it depend on how big I want the flower to grow.  I want to put these flower(s) plants on my patio.  Sometimes during the day my patio has a lot of sun and other times it does not.  What is the best flower plant(s) for this. What is the best way to take care of a repotted flower plant.

Basic rules, go up 2 inches in diameter, bump up from a 4" to a 6" pot  10" to a 12" pot. Make sure you do not plant the plant any lower than it was already growing, burying the crown is gauranteed to kill it, even a little LESS deep is better.
caitlinsdad7 years ago
www.instructables.com/id/How-to-keep-a-house-plant-alive/step6/Pottingrepotting/ 

The instructable can explain it in detail.  If is it not a houseplant, the best flowers are chosen based on your growing region due to the weather and climate.  Go to a real garden center in your town to ask.  Also, there are perennial flowers that come back and bloom every year and annuals that don't.  Good luck.
Good answer, but shouldn't this be in Answers instead of Feedback?