Crash Course

You have picked up a few things, either from brief instruction or observation. 

Choose one Class for which you do not have any levels in.

You gain the following benefits from that class's proficiency list:

• You gain one skill proficiency of your choice.
• You gain one skill proficiency or one tool proficiency of your choice.
• You gain expertise with one skill from the list for which you are already proficient. Your proficiency bonus is doubled for any ability check you make with it. The skill you choose must be one that isn’t already benefiting from a feature or feat which doubles your proficiency bonus.