What is the main difference between bootstrap 3 and 4?

Question

Bootstrap a great framework for front-end developer.

Answer 1

Here's a link for your question.

https://www.quackit.com/bootstrap/bootstrap_4/differences_between_bootstrap_3_and_bootstrap_4.cfm

also bootstrap 4 is less supported in browsers then bootstrap 3 that is why many people prefer to use bootstrap 3.

but overall bootstrap 4 is better than bootstrap 3.

hope you find this useful.