heres a free set of videos that will help you to stop losing at 2nl.

101 series full ring

Basically they are showing you what everyone else is saying about playing tight and are designed to stop you losing , not to crush 2nl. Watch the lectures and its explained why you are doing things and why you should avoid doing some things.

Get the basics right and then you can start adding concepts to up your winrate. Forget about a lot of the strategies talked about in the higher stakes .They are designed to beat higher stakes where players actually realise they have a fold button. At 2nl most players don't realise that you can raise more than just pressing the raise button and don't realise that the time they flopped a full house with 72o was an extreme rarity and that all the time they are limping in with such crap they are spewing money.