What are /r/lookatmyprogram's favorite Products & Services?

From 3.5 billion Reddit comments

It's like discovering copy/paste. It's like discovering keyboard shortcuts. It's like discovering how to save and load files.

It's so fundamental to programming, you'll kick yourself for all the time you wasted by not learning it sooner. Not to mention it's a core skill for any programming job, even more core than knowing any particular programming language.

If you're a Windows guy, I'd suggest getting started with Mercurial. If you're a Linux or Mac guy, I'd suggest getting started with Git. Nobody worth their salt is going to take you seriously as a programmer unless you have some knowledge of version control. I cannot stress enough how critical it is you learn it and use it.