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According to the Bootstrap 3 to Bootstrap 4 migration docs:
Buttons
- Renamed .btn-default to .btn-secondary.
But the Bootstrap 4 .btn-secondary does not look at all like the old default button.
Using .btn-light does not reproduce the original .btn-default either.
How do I get my default theme back for buttons/dropdowns, etc?
I remember a default button in Bootstrap 4, but it was in an earlier alpha version. Has it been removed?
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What does it mean and what is the purpose of it ? btn will define all the basics styles for a button and btn-primary will do the background color, like there are classes like btn-success(green) btn-info(blue) etc. Thats how we should create style classes which we need to reuse.
Button tags The .btn classes are designed to be used with the <button> element. However, you can also use these classes on <a> or <input> elements (though some browsers may apply a slightly different rendering).
btn-primary has white text on a blue background. Adjust the default colors using the --button-color and --button-background-color custom properties.
Bootstrap Versions The main differences between Bootstrap 5 and Bootstrap 3 & 4, is that Bootstrap 5 has switched to JavaScript instead of jQuery. Note: Bootstrap 3 and Bootstrap 4 is still supported by the team for critical bugfixes and documentation changes, and it is perfectly safe to continue to use them.
The btn-outline-secondary class in Bootstrap 4 generates the closest to what used to be btn-default in Bootstrap 3.
That seems to be "typo" there in the docs.
primary is the blue button/color and secondary is the grey ones.
And the very light grey is btn-light.
Here's the reference link for Bootstrap 4 buttons:
https://getbootstrap.com/docs/4.0/components/buttons/
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