WRT using the clutch in traffic, as has been pointed out already, you will not be able to escape some use. However, you can get into a driving style that requires very little clutch operation. Many people tend to set off too quickly when traffic starts moving again, causing them to go too fast and having to come to a complete stop again meters further, which involves depressing the clutch again. Also, many don't realise it is perfectly OK to not apply any throttle and just let the car roll "by itself".
To get into this habit, apply very little throttle when setting off, release the clutch as quickly as possible while still retaining a smooth start, and then control the speed using the throttle paddle, anticipating the movements of traffic ahead. Release the throttle a bit when traffic slows down, apply some when you need to go a bit faster to keep up. Do all this in first gear or, if traffic starts to move a little quicker, second. (Should you get to third, traffic is probably moving at "normal" pace again). Releasing throttle completely (do this smoothly, as in low gear sudden changes in power will jerk the car around) will just get the car rolling on what is essentially idle speed. No need to touch the clutch at any time while doing this. Should you need to go even slower than this idle speed, depress the clutch, and if required apply the break. Then, start all over again
Also, as noted before, when you are going to stand still from longer periods of time, put the box in neutral and release the clutch, as it will wear your clutch otherwise. Putting the car on hand brake is also a nice idea, even on flats, because otherwise you will be blinding the person behind you with your brake lights