What is the average trading fee?

Good day, I was wondering if you could elaborate on the topic of trading fees in the cryptocurrency market. Specifically, I'm curious to know what the average trading fee is and how it may vary across different exchanges. Are there any factors that typically influence the trading fee, such as the trading volume, the cryptocurrency being traded, or the specific exchange? Furthermore, are there any strategies or practices that traders can adopt to minimize their trading fees? Thank you for your insights.