The GN4 Ted4 tutorial introduces you to a basic and intermediate usage of Ted4, through number of tasks than include getting know the workspace, and basic operations: creating and locating content, editing text, formatting content, etc.
For text editing, you can use the Articles main tab in Ted4 or Fred4: the operations are identical. Moreover, to edit text when dealing with pages you can use the Pages main tab in Fred4 (see GN4 Fred4 Tutorial).
Use the Table of Contents to find information. See also Using table of contents in help.