There are many ways to build a cash cow on YouTube, but if you want to succeed fast, you should focus on one niche. That way, it's easier for Youtube to index your videos, and you can branch out later. Pick a niche that's high paying, like e-commerce, real estate, insurance, stocks, and software tools. Other niches to focus on include fitness, beauty, and trending topics. Let's see the secrets behind the profitable Cash cow YouTube Channel! The 5 Secrets!…