Does anybody know a place with short marketing exercises?

Hi all,

I'm looking for some short online marketing exercises I could do each day. I'd love something a little bit fun that could help me practice and get my mindset into the correct place for my hacking project(s).

A friend of mine showed me 'One minute briefs' (https://twitter.com/OneMinuteBriefs) which are for writing ad copy - something like this but for online marketing / customer acquisition would be amazing!

Happy hacking - Nils