XHTML?

I learned all about XHTML today.
Why is it that as soon as I figure out something (i.e. HTML), someone invents something better, which I then have to learn all over again? It's not like I don't appreciate the new improved version, it's just that I'm a busy person.
Please, someone tell society to refrain from created awesome new stuff until I'm done school (or at least summer holidays when I'll have a few months of free time...).

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