Michael Dylan Welch is a famous name in the world of haiku. You don’t have to read many of his poems to understand why.
In Becoming a Haiku Poet, Welch guides the reader through some of the basic techniques of what makes a good haiku. This is an excellent primer from one of the best. Haiku is poetry condensed to its essence, and this tutorial is as condensed as haiku itself.
Welch demonstrates how to use inference to build a strong haiku. This is a technique of subtlety, and as someone once said, it takes confidence to be subtle. My own haiku are most commonly not this subtle, but that mastery of inference is something I can enjoy working toward.
Also, note the link to his tips on writing haiku at the bottom of the article.