Use Case: Current URL button opens an Opportunity edit screen with pre-populated fields.
Lightning Solution: Create a Quick Action.
Old URL Button example
Create a Quick Action
Go to setup menu > Object Manager > Account > Buttons, Links and Actions
Add fields to "Edit Layout"
Set predefined values
Add to Lightning Experience Actions on the Account Page Layout
Verify it’s on the Account Record Page
Once clicked, a pop-up with those fields pre-defined appear.