In a video tutorial focused on solving Bite 21, a coding exercise involving querying a nested dictionary of car manufacturers and models, viewers learn to perform tasks such as extracting data, sorting nested lists, and utilizing list and dictionary comprehensions. The exercise is designed to help beginners become familiar with common data structures and operations, including looping and string manipulation. The tutorial emphasizes the importance of attempting to solve the challenge independently before watching the solution, as this enhances learning and allows for comparison with other solutions via a community forum. Key takeaways include the use of dictionary comprehensions to modify data structures efficiently and the benefits of revisiting previous exercises to reinforce learning. Participants are encouraged to engage with a dedicated Slack community for additional support and insights, promoting a collaborative learning environment.