Openings for blitz


I dont think you should change your openings in different time formats. Usually I would say that players learn less by playing blitz, and although this is true, blitz can actually be better than other time formats when it comes to learning new openings for the following reasons:
1. Many games in a short period of time makes it easier to carve the lines into your memory.
2. People wont be able to punish your mistakes easily in blitz, so you might actually have a fun time even though you dont know what you are doing.
3. Because people rarely play theory heavy lines in blitz, you will face many sidelines that you are not yet aware of. This will teach you principles of your chosen opening rather than specific lines.