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Hopefully, this article will answer your questions: https://www.gardeningknowhow.com/edible/fruits/fegen/dwarf-fruit-trees-a-planting-guide-for-fruit-trees-in-containers.htm

This article should help you: https://www.gardeningknowhow.com/edible/fruits/mango/growing-mango-trees.htm

This article will help you with your apple tree: https://www.gardeningknowhow.com/edible/fruits/apples/pruning-apple-trees.htm As for the mango, these trees rarely require much pruning until after they have reached at least 4 years old, and then remove weak branches, pruning more for shape. That said, you can try pruning it back some, but no more than a third of its growth. Here is more info on mango trees: https://www.gardeningknowhow.com/edible/fruits/mango/growing-mango-trees.htm

You can try pruning it back some, but no more than a third of its growth. Also, give it some phosphorus rich fertilizer or bone meal to encourage flowering and fruiting. How are the pollinators in your area? A decline in pollinating insects can make it difficult for these fruit trees to produce. Humidity and rain can also limit polination. You can encourage pollinators to the area if necessary. Here is more info: https://www.gardeningknowhow.com/garden-how-to/beneficial/insect-pollination-process.htm, https://www.gardeningknowhow.com/garden-how-to/beneficial/creating-a-pollinator-garden.htm

The lack of fruiting may be attributed to a number of things, but the dry, brown leaves could be due to too little water, insect pests or even a fungus. You can try pruning it back some, but no more than a third of its growth. Also, make sure it receives plenty of moisture and give it some phosphorus rich fertilizer or bone meal to encourage flowering and fruiting. Check for signs of pests and see if the browning of the leaves seems to spread. If either of these occurs, try treating the tree with neem oil, which will take care of both insects and fungal issues (and it's perfectly safe to use).