archive page – a list of posts based on a category, taxonomy, post type.

category – to access a limited set of posts.

class – 1) identifies the style to use in the HTML markup.
class – 2) the uninstantiated object in object oriented progamming (OOPS).

directory – what you see as a folder in your GUI, can be referred to as a “directory” in your command-line interface.

footer – bottom of the web page.

GUI – Graphical User Interface, pronounced goo•ey.

head – the HTML tag inside a web page holding data not displayed.

header – the top part of a web page.

hook – a place in core code made accessible to themes & plugins.

id – an identifier in CSS like class, but unique within the web page.

index – 1) points to an element of an array.
index – 2) the first HTML (or PHP) file sought within a directory.

mapping – using a domain you own to access your wp.com blog.

masking – an extreme form of mapping.

menu – list of links to pages or a category of posts.

navigation – menus to other places in a web site.

page – a “post” of the post type page.

permalink – a custom url structure, the permanent link to individual posts.

plugin – a file added to an installation of WordPress, often to provide a widget.

post – 1) a single item of “content” stored in the wp_posts database table, which is one of the five types: post, page, attachment, revision, nav_menu_item.
post – 2) a “post” of the post type post.

sanitize – author name, category, and postname get sanitized in permalinks by having spaces replaced with hyphens.

selector – in CSS, the rule set with declaration blocks (property name & value) pointing to the HTML element to style.

shortcode – a short code, enclosed in braces, that when placed as text in a post or page calls a function to create content.

sidebar – navagation links, to the right, left, or bottom.

Slack – searchable, responsive, collaborative online team communication platform w/ instant messaging and document sharing.

slider – an adjustable electronic control that moves images in a linear fashion

slug – a user-friendly short text used in a permalink.

source set – available sizes of an image that browsers can appropriately download to save bandwidth and speed load times.

style – in CSS, a rule consisting of selectors, and declaration blocks.

tag – 1) an element of the HTML markup language.
tag – 2) used like a category (but without hierarchy) to provide more detail to a post.
$tag – 3) the hook parameter in an action function.
tag, template – 4) PHP function that instructs WordPress to “do” or “get” something. Conditional tags are used in template files to change the content displayed on a particular page depending on what conditions that page matches.

table -1) HTML: a matrix consisting of rows and columns.
table -2) MySQL: The database consists of tables, each having rows of fields.

template – a PHP file controlling the structure of part of the web page.

theme – a collection of templates creating the look & feel (design) of the website.

UTC – Coordinated Universal Time is a “time standard” and not a time zone like Greenwich Mean Time (GMT) but, in practice, share the same current time.

widget – provided by a plugin to give extra function & structure; shows up in the sidebar.