there are two types of dips, ones where you place your hands behind your back, stretch your legs out and lower your rear towards the floor then raise to finish the rep. The other type of Dip is when you get two chairs or something them at your side and then lower your body up and down with your legs off the floor from your palms. those are just the bodyweight ones, not big on weights but there are alot of dips you can do with free weights too.

press ups (you winding me up? You don't know what a press up is? ) are when you lie face down on the floor, place your arms so they are level with your chest and slightly out wards and then push your body up and down fully extending your arms and dipping your chest as deep as you can. 20 explosive press ups will gain more size than 60 half press ups etc. Higher effort needed per press up, just like high weigh bench press - you do less reps at a higher resistance, you gain strength, you do more reps at a lower resistance, you gain endurance.