Hi I just bought these 3 games,can anyone tellme
if I can burn these games onto a dvd so I can keep them
if yes,how do I do it thank you.

Where did you get them from?
If you got them from Steam you can use the Steam backup feature to back up most files
https://support.steampowered.com/kb_article.php?ref=8794-yphv-2033

But you'll probably still need the Steam client installed to get any use out of what you backed up.