None of my therapists have taught me strategies for dealing with anger, but I have learned on my own that you always need to make a healthy outlet for that anger. Always. If you don't make a healthy outlet, then you're just a balloon that's constantly inflating and will eventually burst when you least expect it.

Personally, I dislike breathing exercises for anger because they don't help me, but for some people, they are a godsend. So, it doesn't hurt to try a few breathing exercises to see how you like (or don't like) them. They're quick, easy, and free to do.

What I do like to do for anger is find an activity that fully engages my brain. For example, exercise, playing guitar, reading along with an audiobook, or watching movies/videos. Basically, pick something that utilizes two or more senses at once.

Finally, you may find it helpful to physically write out, talk out, or type out what is irritating you. So, you can do that via this forum, journaling, someone you can confide in, etc. etc.. Though, if you're journaling, you might like to also list the positives of your day at the same time so that you're not constantly dwelling on the negatives. (When you're talking with others, the other person (or people) will typically help you engage in therapeutic things to calm you down, but when you're journaling, you're kind of on your own, so try to write down some positives while you're seething. In fact, for every negative you write, write one or two positives.)