Many of the tips already listed work well for almost every child I've every worked with:
Toddler-proof. This is a temporary stage, and it will be less frustrating for you and your child if fewer temptations are within his sight or reach. If he can't have it, try not to let him even see it.
Avoid using the word "no" when possible. Save it for real emergencies, and for times you are immediately (as in, while you say it) available to physically stop him. This can be done gently but firmly.
Some kids don't start with the "no's" until they're three, but most will get there at some point if that's been the most common command they hear. So teach alternate commands (again, direct, physical direction helps make it clear that you mean it). Try stop, wait, freeze, or other commands. "Freeze" can be made into a fun game, in which you and your son yell "freeze" while dancing or tumbling. This can be an especially useful command when out and about, in parking lots and crossing streets.
Give positive commands and suggestions. Redirecting kids is one of the most effective behavioral corrections. Showing a child what you DO want is often all you need to do or say. At least after some practice on timing.
Comment with appreciation when your child does well. You may have to train yourself to notice, and you may need to start with very small successes. Kids will often respond by doing more of what you appreciate. Just a good word, especially when combined with a friendly smile or touch, is enough for most kids. Wild cheering is overkill for those little things that we should all learn as a matter of course.
Try to avoid giving any command that you're not prepared to follow through immediately. Once your little guy realizes that you're not messing around, you'll notice he complies more quickly and consitently. But remember he's practically a baby, and self-control is something he'll learn gradually over coming years.
Physical punishments and time-outs don't work equally well for all children, and often can be avoided with some planning and attention during this awkward stage when a child is becoming a "separate" person with awareness of his own wants and needs.
Wishing you success!