Where should I start with DeWalt, and is a used DCD794 worth $40?

At $40, the drill could be a reasonable buy if it works properly, but I wouldn’t put much value on the used battery until you know how it holds up. If you’re mainly asking about the tool, check that it runs and that the chuck and settings work before buying.

For the bigger picture, compare that price with a new drill and driver kit on sale. A fresh battery and another tool can make the bundle better value than buying pieces one at a time.

I’d start with a drill and impact driver combo, then add tools when you have a project that calls for them. For ordinary home work, those two cover a lot, and kits can be a better deal when discounted.

If you’re looking at a larger set, the exact price matters. A bundle can have a good assortment and still be less appealing if it includes tools you won’t use. Also check the charger: one kit discussed had a slow charger that could take close to four hours for its larger batteries.

That larger kit sounds useful for a homeowner, but I wouldn’t judge it without the price. The reciprocating saw was described as a weak point for more demanding work, and the multitool was noted for strong vibration. Those may be perfectly fine for occasional jobs, just not necessarily the standout tools in the set.

If you’re doing beginner woodworking, I’d buy around the projects you actually expect to do instead of paying upfront for a pile of tools. Watch for discounts, and fill out the collection over time.