Having said all that, unless you've played a certain amount of poker a lot of strategy will not be relevant to you. If you're just starting out i would read strategies concerning basic ring/SNG/MTT play but you don't necessarily have to understand the finer points of bluffing in 1000NL. Also you need to be careful which area you're reading up on, i remember when i first started out i was playing SNG's but had a starting hand selection designed for ring games, it was useful in that i realised KT wasn't a good hand but it didn't help me when it came to changing gears later on. If you're just starting out and want to be profitable it's best to focus on one aspect (Probably not big MTT's as the time between cashes can be very long) and get good at that.