JavaScript Mastery from Zero to Hero - Prepare for Coding Interviews - Solution - Update New User Database with Splice

The video tutorial guides learners through a coding exercise involving the declaration and manipulation of a function called 'update usernames'. It begins with motivational remarks, followed by a step-by-step explanation of declaring the function, populating an array, and updating usernames using array methods. Debugging and corrections are demonstrated, emphasizing the importance of understanding the process. The tutorial concludes with encouragement and recognition of learners' progress.

What does the speaker mean by 'it's a free copy and paste world'?

What is the significance of the 'Apprentice level up' mentioned in the text?