Hi Vinod,

Generally speaking, PowerServer 2021 can do everything PowerServer 2020 can do and more.  And its cloud-native architecture makes it perfect for running natively in Azure, but the cloud-native architecture means certain tasks are done different. 

AEM is perfect example... now the settings are directly editable in text files, which means you can automate modifying settings and readily transfer the files to another instance to replicate settings.

I recommend first starting with going through the Appeon-U training videos for PowerServer 2021: 

https://www.appeon.com/appeon-u/ps 

Then, depending on what topic you want to drill down and get more info, refer to applicable how-to guide or tutorial:

https://docs.appeon.com/ps2021/How-to-overview.html

https://docs.appeon.com/ps2021/tutorials.html

For example, regarding your question how to define database connections, please refer Tutorial #13: 

https://docs.appeon.com/ps2021/Connecting_to_the_Database.html 

Best regards,
Armeen

Hi Vinod;

  The key to starting to use PS2021 is learning the basics by setting up a local environment first and getting your PB App(s) migrated & running locally first before you even attempt an Azure deployment.  You are 100% correct though that PS2021 totally different than PS2020 as it's a complete rewrite based on a totally different technology paradigm.  FYI ... https://docs.appeon.com/ps2021

  In particular,  I would run through the how-to guide, migration guide, and tutorials etc before starting your App migrations.

Regards ... Chris