I am not as good about my logging as I used to be, but I still do it as I always have, in one of those black and white marbled cover notebooks. I list time in GMT (CUT for you modern folks) , Frequency, either caught from the broadcast itself, or as close as I can get from the dial of the receiver, the station name or call letters, the signal strength and receiving conditions such as interference, and some details about the program I heard. I then try to find the address of the station and list that also. Often foreign shortwave stations will announce their mailing address. Today the internet makes this easier than it was years ago, when we had to look up such things in White's Radio Log. With this information you can send to the station for a QSL card or letter of verification that you heard them. Collecting QSL cards from foreign stations was quite popular when I was young, in the 1960s and 1970s. Is it still as popular today? I used a new page for each reception report, and would attach the QSL card or letter to the page when I received one.