- Call on:

+) The teacher called on me to answer the question, but I didn't know how to reply.

+) The president called on the citizens to unite and fight against the pandemic as the situation keeps getting worse and worse.

+) He's planning to call on Katherine today, that's why he prepares that gift

+) She would have to call on all her strength if she was to survive the next few months.

→ Meaning: 

1) To call on someone in a group is to ask that person to speak

2) To ask someone in a formal way to do something

3) To come to see someone; visit

4) To use something, especially a quality that you have, in order to achieve something

- Learn about sth:

+) I learned about the new policy from the company’s website, and it's really effective.

+) She learned about the history of the city from the tour guide, so now she can answer anything you ask.

→ Meaning: To hear facts or information that you did not know

- Look out:

+) Look out - there's a car coming!

+) I've got a catalog somewhere and I'll look it out if you're interested.

+) You should look out for pickpockets when you’re in a crowded place, or you might get robbed.

→ Meaning: 

1) Something you say when someone is in danger

2) To try to notice someone or something

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