The fastest way to any page, report or action in Business Central is to type what you want. Alt+Q opens Tell Me from anywhere.
Press Alt+Q (or click the magnifying glass at the top). Start typing: "sales orders", "aged receivables", "post inventory cost", "item availability". Tell Me searches pages, reports, actions on the current page, documentation and the setup, and shows them grouped, with the category so you can tell a page from a report.
Three habits that make it faster still: type the first letters of two words ("sal ord"); use it for setup pages you visit once a year ("general ledger setup", "no. series") rather than remembering where they live; and, on a document, use it to find an action on that page ("copy document", "post and send") instead of hunting the action bar. Most experienced users never touch the navigation menu.