How can I get Sisense Basic understanding

Hello Guys,
We are planning to start Sisense for our new project. So, I have some questions : 

1. Is the Sisense has Desktop Version like Tableau or Power BI ? 
2. Is the Sisense has Server version and can we deploy the Sisense Server on our local premises environment ? Like we have deployed Tableau server in our Local Environment. 
3. Is the Sisense good for complex calculations ? like group by , partition etc 

Please suggest some good documentation as well.
Thanks