Hi, my idea is to make long-term income source so I decided to get started with adsense and wordpress. My niche is investing in solar panels for homes as I have interest in this topic and I did my keyword research too. So I setup the wordpress site, bought one article on the topic and applied for adsense but got rejected. I bought another article, which is already on the website and I will write a few more myself but had not tried again with adsense yet. So, my question is there a minimum amount of content required? Also, I know this is not make money fast scheme, that is why I look at it as long-term income source and my eventual goal is to have at least 50 such websites.