How do you know the difference between block level and inline level tags in HTML?

Question

In other words, how do you calculate which one is which?

Answer 1

block level start on new lines and inline ones are.. in line (by default)
https://www.w3resource.com/html/HTML-block-level-and-inline-elements.php

@Vukan not sure about that, <a></a> is an inline element

Answer 2

inline elements haven't closing tag like <img/> and block level have like <p></p>

Answer 3

https://code.sololearn.com/WUWrSMiCq8v6/?ref=app

Answer 4

thanks @Vukan. That was the best answer so far.