The Mutually Exclusive and Collectively Exhaustive (MECE) principle is used to break data into manageable and efficient parts. This page has nice diagrams to explain it.
This list contains software for business use, compared to the open-source/personal stuff listed on the Writing Tools page. Each piece of software has a special niche, and you don’t have to use everything, however it’s good to know the special advantages of a software.
In general, HATs are the flagship tools of the trade, specifically designed to organize technical manuals and reusable segments. This style of composition is called topic-based authoring, and alternatively the tool may be known as a CCMS. They allow setting variables for output targets, “programming” which tailors a written product to many audiences and consumption channels.
While HATs can be used to create a knowledgebase (KB). KB style is suited for customer support, which assumes a less expert audience, and typically hosts more multimedia outputs (videos, interaction, diagrams, learning material) besides the usual PDF or article.
Wikis are another… strange hybrid. It’s like a knowledgebase or cloud storage, but usually private, and sometimes you want to share with guests. They elicit a “yikes” from me. Kind of a necessary evil.
A lot of people use MS Office PowerPoint / Google Slides to create flowcharts, since they have templates and can insert shapes, but they’re not as good as dedicated diagramming programs.