Google “Chrome extensions” to learn what they are and how to use them.
There is one extension that should be installed before all others and learned as to how to use it:
Simplextmanager
A list of my favourite extensions [My most recommended are highlighted] and their purpose:
Checker Plus: a very useful gmail manager
Ghostery: privacy protection
Gorgias: quick responses for extensive gmail users
Grammarly: every writer should have this tool
LastPass: absolutely essential password manager
Power Thesaurus: outstanding tool for writers
Simple Gmail Notes: add post it labels to your emails
Speed Dial 2: excellent manage of your Chrome bookmarks