I was hacked years ago. I was hosting a test instance of a phpbb for a local club. Work blocked SSH, so I opened up telnet. They either got in from telnet or a php flaw and installed password sniffers and replaced some tools (ps, top) with tools that would hide the sniffer service they installed.
After that, I changed my model. My time lab is for learning and having fun. I’m going to make mistakes and leave something exposed or vulnerable and hackers are going to get in. Under this new model, I need to be able to restore the system easily after a breach. I have a local backup and a remote backup and I have build scripts (ansible) so that I can restore the system if I need to. I’ve had to do this twice. Once from my own mistake and one from hardware failure.
When filing paperwork, like in those hanging file folders, the papers should be placed into the folder with the paper’s left margin up. This way, any stapled pages can be flipped through as a bunch rather than individual pages. Also, the most important text tends to be left justified, such as the return address. Apparently this goes counter to every accountant’s training, but I’m sticking to it.