Answer 1

I started using Bulma a couple of months ago because I was looking for an alternative to Bootstrap. Although the purpose of Bulma is basically the same as Bootstrap, the syntax is much clearer. You can install Bulma directly into your computer by using npm after downloading the zip file from the website. You don't need to import anything, you just need to make the HTML mobile friendly (<meta name="viewport" content="width=device-width, initial-scale=1">).
My suggestion is that if you, like me, started using Bootstrap, stick with it. If you are a beginner, start with Bulma and then navigate through Bootstrap and THEN decide which framework is better for you.