LEGO Instructions
Lost your instructions, they got damaged or looking to build your own version of a Lego set then you can get digital building instructions
You can get these from a variety of sources
LEGO
This is the official source of instructions, though they only go back to 1996 and I believe they don’t have every set on there
www.lego.com/en-gb/service/buildinginstructions
LEGO Minibuilds
LEGO Stores have been creating monthly mini model builds to foster imagination since 2009. You can get instructions for 2020 builds.
www.lego.com/en-gb/page/static/minibuilds
BrickInstructions.com
`instructions for a wide range of themes and goes back to the 70s
https://lego.brickinstructions.com/en/categoryList
Swooshable
Another site with instructions from the past. Perfect if you want to recreate those Lego models you had as a child in the 70s and 80s