Ok, First Chromebooks have improved over the years.
Do they have a "Hard Drive" no. they have a SSD. and yes they do have memory you can use Not a lot as a rule though you can always plug in half a terrabyte (500 gig or so for storage. (more or less. I often plug in 16 Gig to transfer to my long term storage / cookbook Windows box
Can you use them offline.. YES but limited Out of the box you can not but there is an app store and some apps like the TEXT editor work rather well offline... Some do not
Many can run a limited version of LINUX as well though I can't tell you the app name to install. I have it on this one
And many can also run many ANDROID apps. this includes Communications apps (need to be on line) and Production apps (Basically Open office type apps. not SPECIFICALLY Open office but a competitor is in the play store).
Big advantage.. I took my old Toshiba out and pressed power Then I took the Chromebook out and turned it on. It ask for a Wi-Fi node. I selected the Dennys I was sitting in and it ask for my GOogle sign in.. and just that fast I was on line.. The Tosh was still in POST.
Catch a virus on teh Windowns (Tosh) and you are in for a job ridding it.
Caught one on the Chromebook caused constant Rebooting.. Managed to get to Settings advanced Power wash between reboots and .. Well the thing wa back up and running in about 4 minutes. Lunch (ordered before I power washed) was yet to be served.
Chrome Web browser by default.
I'm not using 2 Chromebooks most of the time and the Windows box only for "logging" a few minutes every AM and for long term storage and WiRNS (A program that only runs on Widders).
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times