Is the Ninja AutoBarista Pro good for beginners?

Yes. It is fully automatic, so you press a button and it grinds, doses and brews. You do not need to learn puck prep or dial in a grinder by hand.

Does it have a built-in grinder?

Yes. The grinder is built in, so you load whole beans and the machine grinds fresh for each shot. You cannot use a separate grinder without bypassing it.

How big is the water tank?

The tank holds 80 fl oz. That is enough for several drinks before a refill, which helps in busy households.

Can it make milk drinks like lattes and cappuccinos?

It is built for espresso and milk-based drinks, but check that the milk frother or steam wand is included for your version. Milk drinks need that step on top of the espresso brew.

How does it compare with a semi-automatic espresso machine?

It is easier and more consistent but gives you less control. Semi-automatic machines let you adjust grind, dose and pressure yourself, which suits tinkerers more than this machine does.

What should I expect for cleaning and maintenance?

Bean-to-cup machines need regular rinsing of the brew path and cleaning of the milk system if you use it. Plan on a short routine most days to keep shots tasting fresh.