Which cl should I take? VB.NET or SEO?

I would advise you to get VB.net. Nowadays, you can learn anything and everything about SEO as there are a lot of websites that will educate you on how to-do-it-yourself SEO. Unlike VB.net, it's a programming and unless you did not take proper training about it, you won't be able to learn it. If you want to learn SEO start reading SEO ebooks which offers a not-so-complicated to follow steps for newbies and not so techy people. There are some couple of website that can give you more information more than I do... I posted one links below.