I am looking for good introductory resources for basic woodworking. Ideally this would include the basics of design (e.g. different joints, etc). Ideally this would be a book - though suggestions of online resources would also be appreciated.

For context, I have a nephew that has a lot of free time on his hands, hasn't fared well in the education system so isn't ready to move into tertiary education, but is very capable when it comes to working on anything mechanical/hands-on.

I'd like to encourage him to get started on a productive path. I'm sure that if he were to make something that others appreciate enough to pay for it would be invaluable for his sense of self worth and - quite frankly - help keep him out of trouble (he's had his fair share).

I've broached the subject with him and he seems keen so I'm prepared to help him get started by pointing him in the right direction and providing him with the basic tools and resources necessary. If he commits to it - which I'm pretty sure he will - I'd even help him find prospective customers.

I'm not suggesting that he throw himself into making immaculately finished furniture here. I'd like to suggest that he get started by designing and making custom sized planter boxes for the many apartment dwellers in the area with a small courtyard or balcony. Ideally I'd like to see him come up with a design that lends itself to flat-packing and easy assembly - hence the interest in resources that cover the basics of design and not just the practice of woodworking.

Any suggestions would be hugely appreciated.