There is a over welming amount of articles on this subject, but the truth is there is only a few chromebooks involved with this one being the Acer R 13 found there. You know the most upto date models of specific new releasing chromebooks, not those old ones laying around your house that you more than likely have armed with microlinux distros with cruton and developer mode enabled with only a few gigs left of data to actually do crap with. No not those like the many guides will click bait you into, shame on you laptopmag, gottobemobile, and various other sites.
Now keep in mind all of them copy Paste from the Official guide, which you can read here: https://support.google.com/chromebook/answer/7021273?hl=en.
If you came here to read how to well I will give my all to try to not copy paste.
Step 1 DAUH
First you will need a 2017 Chrome Book, it may work on some 2016's but it wont all. Then you need a google account to sign into or make one.
Step 2 UPDATE
Then you need to update it to the lastest version, by allowing auto updates and clicking on the update arrow to restart.
STEP 3 Settings and crap
Then you must bring up settings by clicking in the lower bottom right hand corner by your profile picture, then click the gear
Step 4 Your almost there(if option 6 isn't available)
Then click "About Chrome OS", then click more info, then you must click change channel, then you must click the beta bubble dot thing.
Step 5 Herpa(if you did 4)
Then you must reset for update.
Step 6 (where all old chromebooks go to die)
Once reset you must log in, click your profile pic, click the gear, then look for a checkbox saying "Enable Google Play Store on your Chromebook." if you don't see it, it is because google says fuck you, gives you the middle finger, and go die trying to do a unoffical way you read about on some click bait bullshit way that destroys everything you love and hold dear.
Step 7 The Pesants are gone
You shall be asked to agree to some bull crap, agree to it or be assimilated.
Step 8 Follow the yellow brick road
Follow through the wizard till complete, also sign in some place.
Step 9 GO!!!!
Launch the play store from the bottom left corner O shape thing, and searching for play store.
Step 10 You stupid or something?
Install crappy android apps and enjoy it because I can't.
I hope you enjoyed my version better.