You don’t read a scientific article from A to Z.
First, think about the purpose for which you are reading the text.
Read the title closely ! You can gather a lot of information from the title.
Read the abstract to determine whether the article is relevant for the goal you want to achieve.
Then go straight to the conclusion. Here you will find a summary of the main research results and the contribution it makes to existing knowledge on a particular topic. Take notes!
Do you come across terms, concepts, or topics that are not entirely clear to you? Then go to the introduction section or literature review for background information on these terms and concepts.