A very useful thing that I automated recently is changing my router’s MAC address and subsequently rebooting the modem. For my ISP (xfinity) this has the amazing benefit of getting me a new IP. For a home connection, your IP is the easiest way to track you. Yes VPNs exist and are better (depends on provider, latency, blahblah), but if you don’t mind your ISP seeing your traffic and instead just want to avoid an IP representing your identity, it’s a very easy way to accomplish this.
I learned this back in the day when running into daily transfer limits on free file sharing websites. Big hassle when trying to download multi-part zip archives on a weekend.
Nowadays people upload to Google Drive, plus other hosts have more relaxed limits, so I haven't had the need to do it as often. But it's still useful to know.
I always wondered what happend to the rapidshare/megaupload space that existed if that’s what you mean by “free file sharing websites”. Curious where people moved to/what are the major indexes now?