Keeping opponents confused is the most common rookie anti-skills. If you want your opponent to have an idea of what you want to do then you must plant the seed of deception. Counter intelligence is what they call this in the Military and it is a big part of warfare.
A good poker play will manipulate other in doing the wrong thing but to do this, you must know how to read them first. Being able to read your opposition is important and if you can sit through a few sessions without reading anyone, then that is a failure on your part as a poker player. Playing well is a continuous learning act as you are always looking for little bits of information.
To divide you attention to many things at once is not an easy task at first and it takes time to get used to do thing. As you sit watching and playing, you are drawing conclusions and then you must check your results and that happens at showdown time. Being efficient at reading your opponents is the difference between a good player and a bad player. Be aware of what everyone at the table is doing. Even online you can catch things that your opponent does like if he used the check/fold button will offer some precious clues to the hand he is holding.