How would you approach the analysis of a primary source

I would first read or look at the source on a basis of content, without the question in mind, to make sure I understood what it was I was looking at or what was being said. Then I would revisit the source and highlight key details or quotes with the question in mind. In a written source I would underline quotes I wanted to write about and perhaps annotate, with a pictorial source I would circle any key details such as faces, any text or other important parts of the image. Then I would examine the provenance of the source to understand where and when it was written, who by and, if possible to deduce, for what reason. If any of these factors were likely to affect my answer I would annotate them also.
In my first line I would try to summarise the source and its origins providing the context. In the second line I would answer the question in one sentence, ie. the message of this cartoon is that Hitler's Propaganda in the 1930s was forced upon the german people who had little choice but to accept his rule.I would prove my point by providing evidence from the source and support it with wider knowledge of Hitler's rise to power and the techniques the nazi party used to coerce support. My concluding line would suggest why the source had been produced or what the author intended their audience to gain from viewing it.