For the person who comes through them for the first time, the rules of poker can be confusing. This includes the whole range of them, from the basic rules of play (when to bet, when to expect a deal card, when to check the card holding and so on) to the scoring rules, which govern things like the value of 'hands' and so on.
Of course, in order to participate actively in Poker, you have to master the rules of poker too. Players who are familiar with the rules will not accept near your table if you still have problems with mastering the basics. Poker players that you are usually to be struggling with the more technical aspects of the game, what is at stake to put, to bet in order to increase the chances of success, when to opt for the game to protect their interests ... and so on, instead of the basic rules of poker they see as obvious and we hope that everyone is familiar with.
It does not help matters that poker is a game unique and universal, such as football, where you only have to master a set of rules, and be able to play anywhere in the world. As a result, there are many varieties of poker called Texas Holdem poker, Stud Poker and the poker called Omaha called (with numerous other varieties in between), each with its own unique rules well. In fact, as you realize, all share some of these variants is the name and the fact that he played with cards. Otherwise its rules can be very different.
So how is one to make sense of the rules of poker?
Well, as a first step, you may consider reading through one of the poker tutorials now widely available online. If you do not like the idea of reading, you can still learn the game through the tutorials presented in video form. Help at this stage to ensure that you take the most basic of tutorials, since a large majority of them are, in fact, for people who already are familiar with poker, and just looking "up" your game - which is not what you are.
There are some poker books out there, too, and this may give some insight into the basic poker rules. It may be of some help if you can read about a single variant of poker at this stage to get a good overall feel of the game, before proceeding to examine the variations once you have a good general idea of poker.
Of course, you can not pretend to have an adequate command of the rules of poker until tested in a real poker game. This is one area in which real practice makes perfect. And there are plenty of opportunities to practice poker, even online. You can, for example, ask for a 'demo of the game' in one of the rooms online poker game, where you can measure your actual domain of the rules of poker.