As a new grad student, one may wonder where to start if you either (
1) write a new manuscript; or (
2) read a journal in a lab meeting or school assignment. There is no hardcoded way to answer this. My supervisor uses the following steps in writing a fresh manuscript:
(1) Write the method section: the most straightforward way. You know what you did the most!
(2) Continue by writing the result section.
(3) Continue to bring the discussion, highlight the meaning of the main findings.
(4) Write an introduction and abstract the last.
Writing the introduction and abstract is preferentially the last because having gone through the previous three steps, one is able to have a much better overview or picture of the "value" one wishes to contribute. Note that I don't use the word "meaning" or "scientific contribution" because even if a paper has a good contribution but fails to convey its value to a broader audience, it fails to be recognized.
Reading a published journal is another thing to learn. In our lab meeting, we usually start with the abstract to get a rough idea the paper intention. Then we move on method section and figures (yeah pictures and diagrams, graphs, etc.) We then read the discussion in greater details. Nobody cares much about the introduction.