Is it necessary to convert photos from RBG to CMYK if you are just printing at home?

I am new to the creative suite, and I am using InDesign for a class presentation. I was told I should convert any photoshop images that I use from RGB to CMYK for printing, but I am just printing it at home on my little deskjet.
Second question: If it IS necessary, why do I get a alert in photoshop saying "You are about to convert to CMYK using 'U.S. Web Coated (SWOP) v2' profile. This may not ve what you intend." What does this mean and should I just ignore it?
Thanks in advance for any advice you may have!

The advice you got was specifically for sending a project to a CMYK printing press. Converting to CMYK has been the traditional requirement for those jobs, from the era when most images were printed and most printed images went to a CMYK press.
But it's been many years since that was true. Some InDesign workflows can use RGB images if you set up InDesign to do the conversion to CMYK at output, or if the digital press will be doing the conversion. A lot of digital home printers and newer digital printing presses are set up to work with RGB images. For example, you don't send CMYK images to the lab to have printed enlargements and photo books made, you send RGB. As far as your home inkjet goes, it uses different ink colors than U.S. Web Coated (SWOP) CMYK (some printers use six inks or more), so converting to CMYK wouldn't even match up properly with the inks being used.
That's the reason you see the alert message. It's no longer a world where you convert all images to CMYK to print, so Photoshop is making sure it's something you actually need to do. Because if you convert to CMYK when you don't need to, your images will look worse because CMYK doesn't provide as many colors as RGB.

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