Triceps are important, they make up two thirds of your upper arm mass and you use them in most lifts. As many of you know triceps have three heads: the lateral head, the medial head, and the long head. The lateral head is located on the back of the humerus but to the side, the medial head is mainly responsible for girth of your arm and is in the middle of the other two heads, the long head is responsible for giving “hang” to your arms.
For balanced triceps you need to pick exercises that hit both the long head and lateral head, medial head works as a team with the lateral head. As a general rule of thumb pushdown movements hit the lateral head well, pressing movements hit all three but especially the lateral and medial head, lastly overhead movements hit the long head well. It is very difficult to isolate different heads but some lifts hit the different heads better than others.
Here is the list, Close grip bench, dips, skull crushers, V-bar cable pushdown, L-extensions (ignore the Swiss ball, the only pic I could find), overhead Extensions (barbell, dumbbell, or cable). The first three are probably the most responsible for overall mass, but isolation movements are needed for balanced triceps.