If you are thinking about being a competitive Starcraft 2 player, then you will want to read this Starcraft 2 guide. In it, I am going to show you how to be a great player and what you can do to start winning more games right away in Starcraft 2.
First off, when thinking about a Starcraft 2 Guide, the first thing you will want to get down is general build orders. Every race in Starcraft 2 has build orders which work out pretty well for that particular faction. These are the same builds that professional players use when they start out the match. For example, Terran players typically always build a Supply Depot at 9 supplies and a Barracks at 12 Supplies. This seems to be ideal as it lets you get out Marines before you get rushed and it lets you consistently produce SCVs throughout the match.
Zerg players have more variety in their build orders. Some good players like to start out with a second Hatchery as their first building, whereas others prefer to get a Spawning Pool first. Both are viable strategies, but that is why you need a Starcraft 2 guide. This really helps you decide which buildings to pick and which ones to use.
The next thing you need to worry about as an SC2 player is your unit choice. Every unit in Starcraft 2 can be joined together with other units to form unique combinations, and different army compositions are good against different unit types. For example, Zerg players will find that a Hydralisk army is really good versus a Protoss army consisting of Gateway units, but that same Hydralisk army will be very weak versus an army which is backed up by the Protoss Colossus. If you want to be good at Starcraft 2, you will have to learn which units are effective and be able to quickly change between technology trees based on what your opponent has decided to do.
Finally, one thing that also gives a lot of Starcraft 2 players trouble is their APM score. APM, or actions per minute, is a measure of how many actions a player can take within a given minute. Beginners often have an APM of just 10-20 actions, as an action every couple seconds for a player that does not really know what he is doing is a fairly decent pace. However, professional players often make 200 or 300 actions in a given minute, meaning that they are taking an upwards of 5 actions every 5 seconds, which is an incredibly quick rate.
Simply by playing the game more, you will get good at all of these things. To simply practice is the best advice I can give you as far as unit compositions and APM go. You can also watch replays of high-level