Poker playing requires us to make several decisions, some of which can be considered errors in hindsight. Also, often, the money that we make is the outcome of somebody else's error and you benefiting from it. It is therefore crucial to understand which situation warranties raising as opposed to calling.
The positive outcomes of a raise - If your opponents fold, you get the pot. If you have the best hand and an opponent calls, you make the profit. If you have a weak hand and are re-raised, it shows that your hand may not be the best hand. Now let's look at each of these situations as opposed to calling. When you call, you have no chance of winning the pot uncontested. If you have the best hand you are not maximizing your profit. If your poker hand is bettered by someone else you have will never know. When you call and the pot is raised behind you, it may show a dominant poker hand, a good hand or a bluff. But if you raise and are re-raised, that will obviously be a show of strength.
Of course there are also situations when the correct play is to call. Remember the three positive things that can happen with a raise - If no one is going to fold to your raise, and you don't have the best hand, you have eliminated two of the three positives. If there are no players to act behind you, then just by calling you are not only receiving the correct pot odds, you are also putting the least amount of money in the pot while maintaining your chance to win.
If you wish to adapt a winning no limit holdem strategy, you should usually choose between raising and folding. There are, however, a few situations where a call is suitable. If you know that a raise only is going to be called by a better hand, but there’s a good chance that your opponent is bluffing or holds an inferior hand, call is obviously the best choice.
With practice and experience, you will start to understand when it is beneficial to raise. And when you combine this aggressive play with quality starting hand requirements, you will be on the winning path.