The Microsoft Office Support site offers a wealth of easy-to-follow guides for the use of most of the more common Microsoft software products.
Depending on the age of your software, the information may differ, but the links below should provide a starting point to assist you.
The following links will direct you to the relevant sections for 'Quick Start Guides'.
Further training materials on the main Microsoft packages can also be accessed on the Microsoft Training Center pages.
The links below direct you to the main training packages.
Adobe Acrobat Learn & Support
Adobe products (that create PDF files among other products) have a detail support website to help you learn more about the software.