Can I recreate/redesign a peer reviewed journal article findings (giving proper credits to author, journal)into powerpoint and sell it? Can I recreate/redesign a peer reviewed journal article findings (giving proper credits to author, journal) into powerpoint slide and sell it for profit?
Probably not, but that depends on the copyright holder and on any license that is attached to the work. If there is no license at all, then the answer would be no. But even some permissive licenses have a no commercial use clause. If so, again, no. 

And note that copyright law isn't universal. It varies from country to country. 

And note, again, that it is the words (expression) that is normally covered by copyright, not the underlying ideas. Anyone can write about ideas. 

But, another issue is how you would be looked upon if you do this. Some things that are, strictly speaking, legal, are still frowned upon.