The slides below present strategies on summarizing and synthesizing technical content:

EGR112, Summarizing technical content

The same document that has the practice exercises for reading technical content can be used to practice creating a summary:

Practice reading technical paragraphs (and summarizing)

Just like reading, summarizing an article or technical content isn't a "one size fits all" methodology.  If you prefer watching a video to reading, the link below targets videos on summarizing research articles:

Google search:  strategies for summarizing technical research (videos)