Every installation of Stata includes all the documentation in PDF format. Stata’s documentation consists of over 14,000 pages detailing each feature in Stata including the methods and formulas and fully worked examples. You can transition seamlessly across entries using the links within each entry.
And, Quick starts help new users get started and remind experienced users of common options.
All the manuals are in PDF format which you may view directly or download to your computer.
You can also access the PDF documentation from the Help menu within Stata.