Since you have a Mac...
iPhoto is intended for JPEG images. It will "import" your RAW images... but will then immediately convert them to JPEG and everything they do with the image will be performed on the JPEG image -- which is not what you want.
Apple's "Aperture" application is the high-end RAW-workflow tool... and it's fantastic. I loved it. It was incredibly powerful and the whole tool just made sense to me. I "spoke my language" so it wasn't hard for me to figure out how to get it to perform the adjustments I wanted. Sounds great, right?
Not so fast... about a year ago, Apple decided to announce that they are discontinuing iPhoto for the consumer market and also discontinuing Aperture for the pro market and combing them both into a new app called "Photos" which is intended to be THE tool for BOTH consumers AND professionals alike.
"Photos" is a steaming pile. This reminds me of the time they decided to replace iMove and Final Cut Pro with a new program called Final Cut X. It was a disaster. Several key people at Apple were sacked for it. Apple lost a huge following of pro users. They finally re-wrote Final Cut X into something the could actually hold a candle to the old Final Cut Pro and life moved on with a happy ending. There is (so far) so "happy ending" for photography users. "Photos" is terrible.
Adobe is REALLY trying to push (and push HARD) to get everyone on board with their "cloud" model (which has nothing to do with "cloud" and fails all definitions of cloud-based software but hey that's the software marketing word of 2015 so they're using the term anyway.) What they WANT you to do is pay them $10/month for a minimum of a 1 year term (which means you can't pay them less than $120). For that $10/month you get unlimited use of both Adobe Lightroom CC as well as Adobe Photoshop CC.
But Adobe WILL still "sell" you a single use copy of Lightroom 6 (the "pay once and use forever" version of the software). Finding it is tricky. BTW... Adobe will NOT "sell" you Photoshop anymore. Period. If you want Photoshop, you WILL RENT IT. If you do find someone claiming to sell Photoshop ... it's not legitimate.
Anyway... using Lightroom CC on the Mac is what probably most photographers are doing.
Here's the link
Digital photography software | Download free Adobe Photoshop Lightroom CC trial
If you want to buy the "buy it once and use it forever" version of Lightroom for $149, scroll all the way to the bottom of that page and you'll find it in the extreme lower right corner (until Adobe changes the page to hide it someplace else.... they've been making it hard to find and then telling everyone "we noticed almost nobody buys the single license version anymore... that must mean buyers only want cloud software" -- when the truth is nobody can FIND the single-use software for sale because Adobe goes out of their way to steer you away from it.)