Hey there. I am pretty new to JIRA and they taught us all kinds of basics but not how to effectively use the keyboard shortcuts. I think sometimes one has to use a modifier key, right? Do you have a guide how to?
Thanks!
Sure, don’t suffer any longer 
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Here you will find the Atlassian documentation about the keyboard shortcuts and modifier key usage: Using keyboard shortcuts | Jira Core Data Center and Server 7.2 | Atlassian Documentation
The whole list of shortcuts: Using Keyboard Shortcuts | Atlassian Support | Atlassian Documentation