Is this cabinet good for a garage?

Yes. The steel body and lockable doors suit tools, paint and chemicals, and the 120 lb shelf rating takes heavy loads. It is plain and heavy, so plan for two people during installation.

How much weight can the shelf hold?

The shelf is rated for up to 120 lb. That is enough for a stack of tools or several gallon containers, but keep the heaviest items centered over the shelf brackets.

Does it come with a lock?

The doors have a locking latch with a key. It deters casual access in a garage or shared space, but it is not a high-security safe.

Can the shelf be moved?

Yes, the single shelf is adjustable, so you can set it high for tall items or low for stacked bins. There is only one shelf, so plan storage around that limit.

Is it hard to mount on a wall?

It weighs about 33 lb empty, so get a helper and anchor it into studs or masonry. The 30 inch depth puts load far from the wall, so solid anchoring matters.