My son and daughter have just started working a few months ago. I advised them to keep a work journal. I kept a 100 page notebook in my work bag and wrote things like phone numbers of visiting engineers, or what projects we were starting ..etc. The 100 page notebook filled up and I started a 200 page notebook but retired when it became half-way full

These journals are very useful. For example you need to remember someone phone number six months after you met them. Or you need to write self-evaluation at the end of the year. You will definitely forget the details of what you were doing, unless you write them down.