How to Buy Common Electronic Components to Replace in An Existing Circuit?

A friend of mine tells me that he wants to buy some common electronic components to replace in an existing circuit because some of the original components have been broken in the circuit, so he asks me for help. Well, for such condition, I think there are some key parameters should be kept in mind. The following will you tell you the details.

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How to Buy Common Electronic Components to Replace in An Existing Circuit?