What is the functions of bootsrap

Question

I what to know the difference between bootsrap and jquery and js

Answer 1

JS is a programming language
jQuery is a library used within JS
Boostrap is a frameworks for CSS which stands for cascading style sheet, it basically helps you style your website.
I believe most of these things are covered already in SoloLearn courses.
I see that you have already started one which is HTML
If you are into web development, then finish HTML, try CSS, and go for JS after that, these three are related especially HTML and JS. Be patient, by the time you make some progress in these courses, you will be more likely to understand those concepts.