Don't use Bootstrap! Make your own custom CSS.
Why you should not use Bootstrap. For this go back in time! In your math class, When you were in school, teachers won't allow you to use calculator in class! Why? We were not allowed to use calculator because we have to develop skill to multiply, divide .. in our mind!
In web development world Bootstrap is like a calculator! It helps you to make navbar, slider, buttons etc in sec and that's awesome. But If you don't know how to make a navbar your own! How will you get your skills improve! It's like using a calculator without knowing how to multiply
I am not against Bootstrap! I love Bootstrap and it's free also. I recommend that if you are not in a rush if you and have time, make your own custom elements, Why use a navbar that's less customizable! Bootstrap is very handy when you are in a rush and your client wants you to create a website fast! Or if you are focusing on backend. Bootstrap is great for that!
It's hard to make your own custom element from scratch and it will take hours and even days. But if you build your own custom elements you will thank yourself in the future! Bootstrap would not have a button that's in your mind! Custom elements also make your website standout from the crowd out there!
Building custom elements will improve your CSS and HTML skills and make you more valuable! So I recommend you to not use Bootstrap if you are focusing on frontend part, mastering CSS is a must skill for a web dev!
I am not against Bootstrap, I love Bootstrap and the developers that developed it. It's handy when you want to make a quick website working.. Knowing Bootstrap is also a must! But don't always use it! It's like a calculator of frontend part =)
Comment down below what's your opinion! And if I made any mistake pls mention it (I am new in writing blogs) =)