Notepad Secrets :-

Create a log

1:- Open Notepad
2:- On the very first line, type in ".LOG" (without quotes) then press Enter for a new line
3:- Now you can type in some text if you want, then save the file.
4:- Next time when you open the file, notice its contents. Notepad automatically adds a time/date log everytime you open the file. 

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Text becomes unreadable

1:- Open Notepad
2:- On the very first line, type in "dont eat the donut" (without quotes) then save and close the file. Note: the file should have only one line of the text above.
3:- Now, open the same file. You'll notice the text becomes unreadable squares. (try this with different text with the same format and length).