How to Memorize Important Information

It's so easy to forget things you've learned and that makes it a waste. As long as you have a searchable or easily indexed tool it's all in there. You could just go and look to see did I have something on this topic? Maybe you're not even sure. Other things are going to come along. Some new thing to learn will present itself. That will take the attention of my small working brain. So I want to hold on to it.