Hello! Just wondering if this is truly a Bonsai tree, it was bought from Walmart and that was what it was labeled as. If not, what is it? And how do I take care of him? Some of his leaves seem to be dying. What do I do!?

Hi & welcome! Bonsai means "tree in a pot" so yes, it's a bonsai if you want to call it that. It looks like Pachira aquatica, AKA money tree. Money Tree (Pachira aquatica)

A more stringent definition is a woody entity that has been manipulated over many years to resemble a full-size, unmolested tree.

To keep it small and looking bonsai-ish, it will need periodic maintenance to the above-ground parts and roots. There are many books & websites dedicated to teaching the ancient art of bonsai. If you're not into all that, you can just treat it like any other potted tree: repot every year or two, chop off parts that get too big.

Welcome to ATP!

The term 'bonsai' is a technique, not a particular plant. Literally, bonsai means 'small tray'. Bonsai is the practice of miniaturizing a plant or tree so that it can live in a small pot.

What you have is a Schefflera that has been grown from a piece of stem from a larger plant. It looks like the big Schefflera (Umbrella plant) - keeping it small will not be easy.

Daisy