What is one way to analyze a source for evidence in support of claim

The author's historical context can be relevant. For example, a passage from the bible will have different biases than that of an Islamic scholar. This highly affects what their words will mean and what they'll omit/include. Both of these allow you to form a fully sourced claim and rebuttals in your essay or short response.

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the triple alliance. germany and austria-hungary were already allies by 1879 when, worried about a threat from russia, they formed the dual alliance. italy joined the group in 1882. there was a concern about a possible attack from france and the alliance needed powerful friends to defend it.