It’s a good idea not to delete your top traffic pages.
Why? If user comes to your website from Google and gets 404 page, it’s bad for you and bad for Google. Right?
- On a Vehicle information website: If multiple pages get consolidated into one, it would make sense to add redirects to the original pages.
- On a Yoga website: If yoga workshop is over, it would make sense to keep the original page, even if you remove it form the menu on your website.
Note: You can use Google Analytics to see what pages are the most visited pages on your website.