GuitarTricks has many incredible resources including theory, techniques, styles, and even videos on how to play songs. If you are a beginner or early intermediate this could be a very helpful resource. The instructors are all reputable and since some of them choose to cover a similar style or technique you have the option to learn the same material but from an instructor who matches better with your learning style. The only drawback is that they do not have much for more advanced players. Customer service is very quick to respond to messages and make all processes quick and simple.
"He laid out the lesson very well and I felt as an absolute beginner that was just getting into it, that I learned a lot just in that 45 minutes. He gave detailed notes that I could easily follow while practicing and made sure to explain everything and answer all my questions. He was punctual on time, which I appreciated, and even when he thought he might be running a little late, he texted me to let me know that he might be. Considering his background and the variety of music that he has in his repertoire I really appreciate the style and professionalism that he's going to bring to our lessons. I sought him out specifically over everyone else because of this very fact as that speaks to me, as someone with a music background, of someone that is flexible and willing to not only teach but still learn themselves. I find that invaluable in a teacher and appreciate that."
So, don't get too caught up in strums, as the best approach is to start any new song with this basic down strum. Then, hit the strings on the way up as well, the down-up strum while counting "1 and 2 and 3 and 4 and." This way you are making twice the amount of sound with the same hand motion, giving you a little more movement and fuller accompaniment to a vocal line (melody).
While there is something to be said for learning in this way, it is by no means the quickest (or most effective) way to learn how to play guitar. In fact, you may find that you end up missing out on a lot of the fundamental information that you really should have as a guitar player. As a result, it is not surprising that online guitar lessons are now becoming extremely popular.