Best practices to Dynamically Add, Remove Section to User Profile

I am building a Use Portfolio web page, where I have to input user's info like his education, projects etc. user can add multiple educations in educations and muliptle section's in project sections.

I know the old way to allocate div an id using javascript and when a user wants to add another education, increment div id values and show up the div content.

But I want to use some best practices to achieve this work.