From advanced to expert 
For developers and testers.  
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Some great tutorials to get all Postman tips :

Number 1 : we begin the tutorials with the dev console.
The console is very useful when you are coding your front or for testing purpose.

Breaking news - we will write some javascript inside !

For this tutorial we will need the dev console itself just here :

In the left corner on the bottom.

And the test tab in the request part, just here :

Create a get request to the free pokemon api without any parameters just this call :

https://pokeapi.co/api/v2/pokemon

Should be like that :

Press the send button for submitting our request !
Alright, so far everything ok !

Let's take a deeper look to our main subject by clicking the console button on the bottom

All the call informations are properly retrieved.
And so what ?

Wait a minute, I mentioned some javascript, let's go !
Go to the test tab and write some js :

let pokemons = pm.response.json().results
pokemons.forEach(pokemon => console.log(pokemon.name))

Should seems like that :

Click on the send button to see the result in the console !
Awww wow ! We have it ! A wonderful pokemon list !

We achieve our first goal : Use the postman console for debugging or testing.

Additional tips : you can clear the console on the right corner on bottom of postman.

Next steps :

• Learning to use variables to do something with the pokemon list or any data you get.
• Manage your environnement and keep your infos secret
• Go further in the javascript methods
• Learn to use the mock server
• Go deeper with the automation ... and several very useful things !

Hope it helps !
Daphné Hervé (API, monitoring and QA automation lover)