Q.Mandarin Tree Maturity And Pruning A Young Tree
Question 1: I transplanted a dwarf mandarin tree in the ground in November of 2019 and it has now grown to 130cm high. Last year and the year before, when the tree beared fruits, I pinched all the young fruits off to let it establish. I wonder if I still need to do so this year or I should retain some of the fruits. If so, how many fruits should be left on the tree? Will it affect its growth for a tree only two years old in the ground? Question 2: There arw 6 main branches on the three, of which three branches look thich, whereas other three are thin. I would like to know if I need to trim the three thin branches off, and if I leave them to continue growing, are they beneficial to the tree or they are useless at all. Thank you very much in advance for your kind consideration and time.

Certified GKH Gardening Expert
You can go ahead and let it fruit if you would like. I would only prune if branches are touching or crossing, though. Otherwise, it isn't completely necessary at this time. Here is an article that will help you with the care of the tree:
https://www.gardeningknowhow.com/edible/fruits/tangerine/mandarin-orange-tree-care.htm