When reading the introduction, take note of the citations for earlier work and look them up. You may need to go back 10+ years of papers in order to progress with a recent paper.
The foundations to current best practices appeared in papers published 20-30 years ago. Often people waste considerable time and effort reinventing stuff that was documented 20+ years ago. I won't go into giving examples because that would require slaughtering herds of sacred cows and inviting a stampede of trolls.