Hi I'm new on adsense. I have a website about SEO, search engine optimization. I don't know what's the best channel for me (for a website with content about SEO). Which channel should I choose to get the high paying ads? Should I use general keywords for example "search engine optimization" or specific keywords like "search engine optimization for google"? What's the best to choose from? I'm thinking that those very specific keywords are less paying than a big general keyword that everybody choose and the payment is high..?//..or Am I wrong? Thanks.
Channels in adsense helps you to track effectiveness of ads (cpm, ctr etc), you can't select keywords by them.
Yes, channels can't help you with keywords. It's your content that will determine the keywords to picked up by the Adsense spider.
I do not think the seo niche is high paying one compared to the well known such as mortgage / loans. However, there are a plenty of seo companies that pay high for the ads, but only quality based on geography location. You have to mix both good paying keyword that attract targeted visitors from the region / country that advertisers expected.
Traffic ads placement color bleding and most of all old is gold site and adsense old u grow more better u be.