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You can change the elements common to all pages, such as menus, headers and footers, in the Customizer.
All changes on the page are made in the Gutenberg Block Editor
Each page in the editor consists of individual blocks. This is the following list.
Demo layout of the JGU blocks. Take a look at what's available.
Optional: Translate pages with wpml

Name DE / EN	Description	Species*
Query loop	Display posts or pages as a list or in columns limited by category. Optionally linked to templates. (new since WordPress 5.8) WordPress instructions external instructions	core
Paragraph	Standard block type for text that is added to the editor.	core
Abschnitt / Section	Colored section to the web page. Video	JGU
Spacer	White space between blocks.	core
Accordion / Accordion	Group of open and lockable elements. Video	JGU
Alert box, grid	Alarm box, which can contain an image, a list, a title and simple text.	JGU
Anchor Navigation / Anchor Navigation , Anchor Point / Anchor Point	Added anchor points are automatically displayed here. The anchor navigation only works in the frontend. Video	JGU
Archives	Daily, weekly, monthly simple link list of ALL posts of your own blog, a standard block.	core
Audio	Play sound file.	core
Collapsible area / Collapsible Area	Group blocks and display them in a shorter, expandable form.	JGU
Beitrags-Archiv / Post Archive	All posts from other subsites of the multisite with integrated search and "load more". (JGU).	JGU
Post footer / Single footer	Icons that allow you to share or print the web page. (JGU).	JGU
Picture/Image	Inserting an image and everything to do with images	JGU
Bildergalerie / Image Gallery	Display images in a gallery. NOT translatable with WPML, must be created in the new language. Video	JGU
Biography of the author	Show the biography of the author of a post/page, as entered in WordPress.	core
Blog Archive	Alle Beiträge in Boxen, optional mit Bildern.	JGU
Button	Button, button, key... Insert one or more button(s).	JGU
Classic	Use the classic WordPress editor.	core
Code	Displaying code.	core
Colors	The valid JGU colors are rendered on the page for an overview.	core
Cover	Add an image or video with a text overlay.	core
Datei	Add a link to a file for downloading. Unstyled - do not use at the moment	core
Details	Hide or show additional content.	core
Events Slider	Interface to veranstaltungen.uni-mainz.de	JGU
Flexibler Absatz	Text adapts to the available space in the container	core
Shape	Forms. Gravity Forms:	extra
Formular für Kommentare	Show a contribution form for comments.	core
Fußnoten	For notes that are to be moved from the body text to the bottom of the page.	core
Group	Collect blocks in a container.	core
JGU FIS	Interface to publications from Research Elements.	JGU
JGU IdM Organization	Interface to personen.uni-mainz.de. Displays a list of people in an organization with the selected details.	JGU
JGU IdM Person	Interface to personen.uni-mainz.deDisplays information about a person from personen.uni-mainz.de.	JGU
JGU Jogustine	Interface to Jogustine. Displays courses from Jogustine.	JGU
Category list	Show a list of all categories - with links to the corresponding pages/posts.	core
Klassisch	Use classic WordPress editor in a block- untested-	core
Key Facts	Fact list with icons in study fact sheets. Insert one or more key fact(s). Video	JGU
Comments	Allow the display of post comments using different visual configurations.	core
Contact / Contact Card, Grid / Grid	Insert the contact details of a person.	JGU
List	Create a bulleted or numbered list.	core
Liste (erweitert) / List (enhanced)	Creation of an enumerated or numbered list, optionally with icons instead of bullet points. Video	JGU
Listen Element / List Item	Individual list elements.	core
Logo Grid / Logo Grid	Insert several logos into a grid.	JGU
Mathematics	Mathematics formulas with LateX - barely tested - centered	core
More	The content before this block in a post is displayed in the text excerpt on an archive page in which, for example, the posts of a specific month are listed. Instructions and demo of the display in an archive page for posts	core
Items and text	Items and text side by side. Instructions and demo	core
Modal	Opens as a window in the browser window. Use ONLY for short simple texts! Test on mobile! Video	JGU
Name of the author	Show the name of the author of a post or page. Instructions and demo
Navigation	In Verbindung mit dem Cover viele Gestaltungsmöglichkeiten	core
Latest comments	List of the latest comments.	core
Latest posts	Displays a list of the latest posts.
Notification Banner	Note across the entire width of the window, which can contain an image, a list, a title and simple text.	JGU
Numberbox	Number box that can be displayed incrementing in the frontend.	JGU
Post archives	Archive of all posts from various subsites of the multisite with integrated search.	JGU
Post Listing	Post list, also of other subsites, only the first 20 posts.	JGU
Process Sequence	Process flow consisting of several steps. Video	JGU
Tabs	Group of tabs. Video	JGU
RSS	Show entries from any RSS or Atom feed.	core
Keyword cloud	Cloud of the most used keywords.	core
Focal points / Focus bars	Key points in the form of a bar in percentages.	JGU
Page Header	Standardized page header for JGU web pages. Can only be used once per web page. Video	JGU
Page list	Displays a list of all pages.	core
Page break	Separate your content and present it on several pages.	core
Slider	Slider for several blocks or items that slide horizontally into the image with a click. Video	JGU
Columns	Display content in multiple columns. Video	core
Step by Step (Application Guide)	Step by step Form.	JGU
Stack	Align blocks vertically.	core
Study finder	List of all degree programs, cannot be used with other data	JGU
Search	Insert an input field for the text search.	core
Table	Create structured content in rows and columns.	core
Teaser box	Teaser box in which you combine text with images, videos or audio content. Video	JGU
Testimonial	Testimonials = report. In study profiles, a report or recommendation from a student. Video	JGU
Separator	Separate your ideas with a horizontal divider.	core
Heading / Heading	Insert a heading. Video	JGU
Verse	Add poetry. Use special spacing formats. Or quote song lyrics.	core
Video	Inserting a video	JGU
Templates	Reusable groups of blocks.	core
Preformatted	Add text that allows spacing and tabs.	core
Continue reading	Displays the link of a post, page or other content type	JGU
Line	Align the blocks horizontally.	core
Quote	Visual highlighting of quotations.	core

Core = part of WordPress, only conditionally styleable by us, the behavior can change with WordPress update.

JGU = JGU's own block, completely styleable