Your basic poetry handbook

Summary of verse forms
Feet note
Lines
Stanzas

 

OTHER CONSTRAINTS
A number of these were devised or codified by OuLiPo, the writers' group founded by Raymond Queneau and François le Lionnais. See A Catalogue of Procedures by Harry Mathews on the Oulipo website.

The Little Box constraint, devised by Jacques Jouet, prescribes a six-line poem with the following syllabic count
    7 7 8 * 8 7
The word placed 'in the box', marked by the * asterisk, determines the nature of the other lines. If it is a noun, there shall be no noun in any other line; if it is a verb, there shall be no other verb. The whole poem forms a single sentence.
See my example here

The Prisoner's constraint allows the use of only those letters of the alphabet that do not have ascenders or descenders―in other words, that are within what typographers call the x-height of the characters. These letters are
    a c e m n o r s u v w x z
It is so-called because of the conceit that the prisoner has a limited amount of paper and wants to write the maximum amount without overlapping lines.

[more to be added]