Maybe you wanna start using 1password or lastpass, but you have all your passwords saved in google chrome. Export them, duh, it's easy.
​ 

• Open google chrome.
• in the URL bar type: chrome://flags
• in the next window you'll see a search bar, type: password
• a few results will come up, look for "password export" and "enable" it with pull down menu to the right. 
• restart chrome. 
• in the URL bar type: chrome://settings/passwords
• in the next window look for the heading "Passwords" and click the three vertical dots, select "export."
• in the next warning window select "export passwords."

A CSV file will be downloaded that contains all your passwords. You can import that to most password applications. 
DON'T LET ANYONE GET YOUR PASSWORD CSV FILE. DELETE IT ASAP. 

You're welcome. 

There are lots of long blogs about how to do this. Some are written for the beta version of High Sierra and are wrong. Here's the quick and dirty on trashing your APFS disk in High Sierra and go back to HFS. 

Why?
APFS is brand new disk partition type that Apple introduced in High Sierra. Although it has some benefits, I don't care for it. Anything that apple releases that is brand new, be weary, there are usually issues with it. Also, if you're a mac tech reading this, upgrading OSes or converting from HFS to APFS to solve performance problems is not a solution. If you need help understanding why, email me. 

***WARNING: THIS WILL DELETE THE CONTENTS OF YOUR HARD DRIVE. MAKE A BACKUP***

FIX:

• boot into the recovery partition by holding command-R during boot.
• click utilities in the top menu. 
• select terminal.
• type and hit enter: diskutil list
• you'll see the list of all the drives. look for "APFS" then the disk identifier to the right, something like "disk0"
• type then hit enter: diskutil apfs deleteContainer disk-identifier-here

That's it. You can now re-install, re-store, re-image to your HFS disk however you like. You're welcome.