Which other sites? Jesus! Where would I start? They're all better!! LOL. But seriously, just Google, like I did, and you'll see what I did. As soon as I post a link, you'll say I'm affiliated to the site. So I won't. But go ahead, please, just use Google. Go on... you know you want to.
Going back to the teaching topic. There are teachers, and... there are teachers. Now, I don't know which educational establishment you attended (if any) but some of the teachers at my old school would have made a pile of horse s h i t look intelligent in comparison. We had an English teacher who was a wannabbee author, who only ever got published in the school magazine, a gym teacher who thought he was a professional footballer, but his only real attributes were that he had a loud voice and he was twice the size of any boys, so he could push them out of the way (his tackling style), a Geography teacher who, in his head was Scott of the Antarctic, yet he'd never left the country... I could go on, but you might be getting the message here that not all teachers are good teachers.
Now, lets talk about teachers who did know what they were talking about. My maths teacher, very nice bloke, passionate about his subject, but the strange thing was, he wasn't a wannabbe nobel prize-winning theorem buster, and then there was My Physics Teacher, he knew so much about physics, I swear I believe his head could have just exploded, but he never seemed to have any pretensions to splitting the atom in his lunch break, or inventing cold fusion. Then there was my Chemistry teacher - no wait. forget him, I just remembered, he was an a r s e h o l e.
See, here's the thing which really gets up my nose. You see it time and time and time again on the Net. It's people who present themselves as teachers, mentors, educators who describe in glowing terms their huge and profitable experience in the field, purely in order to establish some credibility, before they hit the sucker with the fee.
It's just so tiring. I wish people would just give it a rest. They are so f u c k i n' transparent, it's untrue. It would be hysterically funny if it weren't so bloody sad. And what's even sadder, is the millions of sucker who are taken in time and time again, and hand over their cash to these self-styled gurus, for their s h i t systems.