We've started using StackOverflow for Teams (https://stackoverflow.com/teams https://stackoverflow.com/teams). It's really good, most of the company knows the e

We've started using StackOverflow for Teams (https://stackoverflow.com/teams https://stackoverflow.com/teams). It's really good, most of the company knows the experience pretty well already. But, as others have pointed out, adding a tool won't create knowledge. You need to foster a culture of creating documentation, writing notes, just writing everything down. It's so easy to relax after a hard problem, but if you document it, then it will be easier in the future.