Is it correct: So when is the wedding planned for?

Hi everyone! I am cooking. – OK, I'll call you back at a more convenient time. - do we need an article here ' at a more convenient time.'? Thanks

What is better: Warning: this meeting is being recorded. Caution: this meeting is being recorded.

They bring clothes to the stores on Monday and until the next Monday the assortment is still the same but the price goes down. Is there any mistakes? Thanks

Children go to school and they get infected FROM OR BY one another.

He's very effective in his job. Can we say like this? a person who has an experience. Why we don’t say an experience? Because we can not touch it?

These robots are valued in surgery. Robots are high precision with good accuracy, they say. - is the sentence correct?

What does ‘appetite against’ mean? It is the same or opposite to ‘appetite for’? For example, there is out there an appetite against political correctness.

Children feel anxiety. OR Children feel anxious.