The cTrader Help Center is the official user guide to learn how to use the cTrader trading platform, the link below starts with how to install the trading platform, please note this is for the Windows installation only.
Official cTrader Help Guide
The official help guide is comprehensive but may be missing some new features.
ClickAlgo - cTrader User Guide
This version of the user guide may contain features not in included in the official cTrader user guide.
The Complete cTrader Desktop Video Tutorial
If you are new to using the cTrader trading platform then these YouTube video tutorials will help you get familiar with it as quickly as possible so you can focus on trading.
Please do not post your questions on this thread, post here instead.