There is not much need in just remembering facts. Since there is always gonna be more facts than you can possibly remember.

Instead, you will need some facts in your working memory while you are at work with something in particular.

Then when you move on to the next project, you will forget the old and learn new.

Other than straight facts, general ideas and concepts you can understand so that you remember them. Those stuff you use in another way than facts even if they could be related