To understand how to use TradingView, you don't need to download and install anything - everything works right in your browser. The service is available on any platform -Windows / Mac / Linux. There is an application for iOS / Android.
Registration is not difficult, as on any site - you can use e-mail, you can use your google or facebook account. A lot of functionality is available for free, and unlimited in time, and for full-fledged work then you can take the minimum paid package.