Making the changes from Dev server to Production server

Hello team,

I am having 2 CRM servers Dev and Production. I have created some plugins, for,s and workflows in Dev Servers. Now I would like to move them to production.

I am not clear that should Import the solution or export the .bak file into the Sql.

And also any help or guidance when to use .bak file and when to use the crm solutions is highly appreciated.

Thanks