When considering the optimal channel to utilize for 5GHz Wi-Fi, it becomes imperative to inquire not only about the channel availability but also the potential impact of your choice on overall network performance. Which specific channels within the 5GHz band should be prioritized for efficient data transmission, especially in densely populated areas where interference might be prevalent? Are there particular characteristics of each channel that could influence your selection? Furthermore, how does one ascertain the levels of congestion and channel overlap in their immediate vicinity? With multiple channels available, is there a recommended approach or method for assessing their current usage before making a final decision? Additionally, could environmental factors play a significant role in shaping your channel selection, and if so, how do you consider addressing those when finalizing your setup? Ultimately, what are the best practices that could guide you in selecting the most effective channel for ensuring optimal Wi-Fi performance in your specific context?