how can i take an offline tutorial from internet?

[Haris]

i want to have an offline for me from w3schools how can i take offline
that can i read and study if there is no internet connection.

[hinhthoi]

If you can obtain permission from the website owner, you can copy it manually. If there are a lot of stuff you want to copy, use php to scrape the content.
file_put_contents('file_name.html', file_get_contents($url));