Some main changes from my experience:

1. Quick find and replace

  • replace badge badge with badge bg
  • replace jumbotron with card bg-light
  • replace card-deck with row row-cols-1 row-cols-md-2 g-4 or card-group
  • replace form-group with mb-3
  • replace font-weight with fw

2. Replace all dropdowns with bootstrap 5 dropdown code, including navbar

3. Margins

left and right replaced with something like start and end. Meaning, we would have <ul class="navbar-nav me-auto"> and <ul class="navbar-nav me-auto"> for navbar-end (right) and navbar-start (left)

Surely, there’s more but these are the basics to get it working :)