hey i have a blogger and i was think of joining wordpress is it ok that i run 2 blogs about same thing with the same contain. one on blogger then one with wordpress
if you have duplicate contents, google will penalise 1 of them or maybe both. meaning in Search Engine Results Page (SERP), your site might be listed in 2nd or subsequent pages when it is supposed to be listed on the 1st page for some particular keywords. So similar content/niche is alright, but not the exact blog posts, it will harm your blogs.
Yeap duplicate content can be a problem, really do not see the point too. Why not spend more efforts on having two blogs with different contents instead. Or you can do some brief rewrites.
Self hosted wordpress would be the best, I don't really think much of the blogger and the free wordpress.com. With self hosted wordpress, as and when your blog gets popular you will find it easier to sell as compared to those under blogger and wordpress.com
Do you mean content? I would say anything that you feel you are most knowledgeable in and can produce contents which are unique only to your blog.
I wouldn't suggest having duplicate content, like others already mentioned, but I would go with self-hosted Wordpress if you're looking to make money online. Though, when I was on Blogger, I still made money so it's tough to say.