Anniversary is the date in which an event took place in a previous year. This could be a good event such as a wedding anniversary, a promotion, new house or anything with a reason for celebration. It can also be an event such as the beginning of a war or a traumatic accident or a loss or death. And still, an anniversary marks the date of an event whether good or bad.
There is no doubt that learning yoga, or anything new for that matter, requires a sense of commitment. Even if you were to decide to learn how to play the piano, you would choose a teacher and commit to lessons and expect to spend time practicing if you want to learn the subject. Why should learning the vast subject of yoga be any different?