Difference between Bootstrap 3 and Bootstrap 4:

Basis off Bootstrap 3 Bootstrap 4
Grid System It is based on 4 tier grid system (xs, sm, md, lg). It is based on 5 tier grid system (col, sm, md, lg, xl).
CSS File LESS SASS
Horizontal Form .row class is not required using grid in forms. .row class is required when using grid in form.
Primary Unit px rem
Font Size 14px 16px
Responsive Image Use .img-responsive class. Use .img-fluid class.
Image Alignment Use .pull-right and .pull-left class. You can use .pull-right, .pull-left
Offsetting Columns Uses col-*-offset-* classes to offset columns. For example, col-md-offset-4. Uses offset-*-* classes to offset columns. For example, offset-md-4.
Flexbox No Yes
Generic Class No mt-1, pt-2

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