I recall reading something that fits in with what @ButIHaveNoFear says about looking/noticing the extraverted functions first:
If you're looking to be better able to type others and don't know where to start, I find this link here to be helpful~
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As odd as it may sound however -- while I truly can relate to all that this article is saying! -- I can also spot Si a mile away. I find it to be a very easy function to pick up on; it just involves listening to what someone is talking about, and how often they bring up memories, or how something relates to what they've previously experienced. Very interested in learning the details of something, also may have a sort of "tense" or "nervous" air to them. Actively seeks comfort.
If you're looking to be better able to type others and don't know where to start, I find this link here to be helpful~
Tell me what you think! ♡