To write an effective thesis, you want to be clear and concise. State your main points and your stance on the issue. I'm not sure from the points that you mentioned what your stance is, but if you were pro-online classes, you could write something like this: In an age that is rapidly shifting towards technology use, online classes can be a viable option over the traditional classroom because of their flexible options, lower cost, and ease of use. Another idea could be that they offer a chance to build skills with using various technologies, which in this day and age, can only help make students more marketable. Hope that helps somewhat!