To send someone to a specific moment in a video, add &t=140s (for 2 minutes and 20 seconds) to the end of a YouTube link.

If you're logging data, use Ctrl + Shift + ; (semicolon) to instantly drop the current time into any cell.

If you are looking to manage timestamps in your current workflow, here are the most effective "solid" methods:

Timestamps: What Are They & How To Timestamp on YouTube - Trint