Jack of All Trades is a Bard feature gained at level 2 in the 2024 SRD. You can add half your Proficiency Bonus (round down) to any ability check you make that uses a skill proficiency you lack and that doesn't otherwise use your Proficiency Bonus.
You can add half your Proficiency Bonus (round down) to any ability check you make that uses a skill proficiency you lack and that doesn't otherwise use your Proficiency Bonus.
For example, if you make a Strength (Athletics) check and lack Athletics proficiency, you can add half your Proficiency Bonus to the check.