What is difference between public and private key?
What is Bitcoin address?
How do I receive a Bitcoin?
What is Bitcoin trust?

https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://mindmajix.com/bitcoin-interview-questions&ved=2ahUKEwifpoaRl6yBAxV3RkEAHRW4BBEQqb0CegUIABCrAw&usg=AOvVaw2NC7r3XoFQYnqrpoBnM21m

Bitcoin trust is based on the fundamental valuations of human faith in mathematical algorithms, encryption and numbers on network operations.

How to receive Bitcoin simply provide the sender with your Bitcoin address which you can find in your bitcoin wallet.
What is your answer for first and second questions?