Why fruit plants in a pot fail to produce fruit?

Question

In my residence some fruit (Guava, orange,mango) plants are in pots.I don’t know to make soil, what fertilizer to be used, when and what quantity to be used.

Answer 1

These articles should help:

https://www.gardeningknowhow.com/edible/fruits/mango/mango-trees-in-pots.htm

https://www.gardeningknowhow.com/edible/fruits/guava/growing-guava-in-containers.htm

https://www.gardeningknowhow.com/edible/fruits/oranges/orange-tree-container-care.htm