I'll just add a bit more and expand on James above.
Over the years I've taught many people, the majority who lost interest when they realised they had to put a bit of work in.
The first thing I'd ask people is "What exactly do you want to learn? Do you want to become a 'Musician' or do you want to sit with an acoustic and strum songs?".
If they answered Musician I would tell them I'm not the person for them.
I'll go back to my first 'student' in the 70s and he said he'd love to be able to play American Pie by Don McLean so that's what we set about doing.
I taught him G, C & D which were the chords needed for the first 3 lines in the chorus, he went home, came back the following week and had cracked it so we then went on to the last line in the chorus which was Em, A, Em D (I think).
He went home and played until he could sing all the chorus while strumming.
Third week I said that he now knew all the chords to the song (might have been a couple of minors and 7ths) but he was equipped to play it so gave him the chord sheet.
On the 4th week he played all the song to me plus a couple more that he decided to learn because he now knew all those chords.
There wasn't a 5th week and a few months later he was getting up and doing a couple of songs at open mic's.
You then get the opposite, a bloke said he would pay me extra to go to his house and when I got there he had bought a Gibson Les Paul Standard and a full Marshall Stack
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He hadn't got the slightest clue and I helped him to sell them on a month later.