Good to know!

Absolute Measurement: Fixed values expressed in finite terms and cannot be altered. 

Relative Measurement: Measurements linked to type size. Example: leading changes according to type size in order for letters not to mix in with each other.

Points/Picas: A point is a unit of measurement used to measure the type size of a font referring to the height of the type block. A pica is a unit of measurement equal to 12 pts. Is more commonly used for measuring lines of type. 

x-height: the height of the typeface in reference to the height of the lowercase 'x'.It's measured by the baseline to the meanline of the typeface.

The em: Relative unit of measurement used in typesetting to define basic spacing functions and is linked to the size of type. The size increases as the types size increases. 

The en: A relative unit of measurement equal to half of one em. 

Dashes (hyphen, en, em): The en rule denotes nested clauses and can mean ‘to’ in phrases such as 10-11 or 1975-1981. An en is half of an em while a hyphen is one third of an em. increases. An em equals the size of a given type and implies the width of the capital ‘M’. Not always will this equal. 

Alignment: the position of type within a text block. 

((-Justifcation- uses three values for type setting: minimum, maximum and optimum-Flush Left- text aligned to left margin -Flush Right-text alined to right margin))

Letterspacing: adds spaces between letter forms to open up words and make it easier to read.

Kerning: removes spaces between characters.

Tracking: is the adjustments of space between characters.

Word spacing: is the spacing adjustments between words.

Widow: is a lone word at the end of a paragraph.

Orphan: is the final one or tow lines of a paragraph separated from the main paragraph to form a new column.

Leading: is a printing term that refers tot the strips of lead that were inserted between text measures in order to space them accurately.  They are specified in points and it allows the characters to "breathe" so that it can be read easily.

Indentation: provides the reader with an easily accessible entry  point to a paragraph.

Hanging indent:  is similar to a running indent (which is an indentation from the left or right margin, which affects several text lines) except the first line of the text is not indented.

First-line indent: is the text that is indented from the left margin in the first line of the second and subsequent paragraphs.