what is the different between RSA and DSA public key on data feed section? which one should be used when I want to send data warehouse data to SFTP? Here is my emil : firstname.lastname@example.org
It depends on your companies environment.
Give the keys to your IT team and they should know which one they need to use.
Give them this document as well, this works for Data Feeds or Data Warehouse
Send Data Warehouse requests to SFTP servers
Steven Hofhiens | Adobe Support
From my Knowledge, Data Ware House export requires only RSA Key. Link : Send Data Warehouse requests to SFTP servers
RSA and DSA Public Key on Data Feed might be used for SFTP Export with and without password. Link : Connect to Adobe via SFTP without a password