I have my old project written by old bootstrap 3.3.6 classes. Now I want to use the features of bootstrap 5.2 but it's not straight forward to just change the version of the bootstrap. What's the best way to do this upgrade? Do I need to change all the code again?
i tried by to change the latest version cdn but all my project will be broke
Go through this document: https://getbootstrap.com/docs/5.0/migration/
After the change, your project will be broken. Just change the class names in HTML code. Your site will be fine. But it will be tough because you have to check all your code.