+1. Atlassian tools catch some flack (for good reason), but I worked at a company where anytime someone had a question that their immediate neighbor couldn’t answer, the response was “try checking Confluence, I usually find stuff there”. It made my onboarding SUPER easy because I could basically Wikipedia every internal process/setup/best practice. Awesome feeling.
I think Confluence - so long as it isn't overloaded with plugins - is the best Atlassian tool. Sure, it's basically a WYSIWYG wiki editor, but the page browsing and shortcuts and everything just work really well.