Below are resources about how to read a scientific paper.
In the view of this library guide's author, it's important for you to find an approach that you like. Recommendation: for the sake of time management, find an approach that enables you to assess quickly the relevance of a paper. The literature about most subjects is now massive, so it is important first to winnow down the number of articles to read. Then find a strategy that enables you to get the gist of the article and clues you into what is important to focus on in the article.
Here is a sampler of items that a Google search revealed: