Windows 10 Boot Into Safe Mode
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as of 12/02/19

Startup Options When Windows 10 Can't Finish Start-up or Login
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Method 1
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1.  Interrupt power-up 3 times in a row after seeing the Windows 10 
    logo.  This should put the computer into diagnostic mode with
    blue/white screens
2.  Under "Automatic Repair" choose "Advanced Options"
3.  Choose "Troubleshoot"
4.  Choose "Advanced Options"
5.  Choose "Start-up Settings
6.	Choose "Restart"

7.  Choose "4", "5" or "6" of the Safe Mode options.
8.  Login with the administrator password--probably is "password"
9.  Adjust password of the user account under Settings

Method 2
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1-6 (same)

7.  Choose 
8.  In command prompt use: 
        bcdedit /set {default} safeboot minimal  <Enter>
    You should see a notice of successful entry
9.  Exit the command prompt
10. On the next blue/white screen choose "Continue"
11. Login with administrator password and make necessary changes.
12. Restart the system and re-enter command mode.
13. Then use:
        bcdedit /deletevalue {default} safeboot
    This will let the computer boot normally.

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Startup Options from Normal Windows 10
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Step 1: Right-click Start button and navigate the mouse over Shut 
down or sign out, which reveals a bunch of power options.

Step 2: Press and Hold Shift key and then click Restart. Wait until 
your computer reboots and enters into the Advanced Options screen.

Alternatively, you can access Advanced options via Settings app 
(Windows key + I) and then navigate to Update & security > Recovery. 
At this moment an Advanced Startup screen followed by Restart now 
option should appear on the screen. Just click it.

Step 3: Your computer will now boot into an option-laden screen as 
shown below. Just hit Troubleshoot to continue.

Step 4: Click Advanced options > Startup Settings and then hit 
Restart.

Step 5: Let your PC automatically boot into another Startup Settings 
screen, with a bunch of startup options listed along with a 
selection number. Just press the '4' key or 'F4′ key on your keyboard 
to initiate the reboot into Safe Mode. You may also boot into 
Safe Mode with Networking, by pressing '5' or 'F5′.

System Configuration Utility
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Step 1: Right-click Start button and choose Run.

Step 2: Type msconfig in the Start > Run box and hit Enter.

Step 3: Wait until System Configuration is launched, then go to the 
Boot tab and check the Safe boot option under Boot options. Also 
ensure Minimal is selected as the sub-option. Besides, you can 
enable the Network option, if you wish to maintain network 
connectivity in Safe Mode.

Step 4: After you have chosen the desired options, just hit OK or 
Apply button, and restart your computer. Your computer should now 
boot directly into Safe Mode.

Later deselect the Safe boot options under Boot options.
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https://support.microsoft.com/en-us/help/4028457/
windows-10-reset-your-local-account-password 
 
(Last Updated: May 23, 2019)

From Microsoft: Reset your Windows 10 local account password
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Reset local account password for Windows 10, version 1803 and beyond:
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If you added security questions when you set up your local account 
for Windows 10, then you have at least version 1803 and you can 
answer security questions to sign back in.

After you've entered an incorrect password:
 
1.  Select the Reset password link on the sign-in screen. If you use 
    a PIN instead, see PIN sign-in issues. If you're using a work 
    device that's on a network, you may not see an option to reset 
    your password or PIN. In that case, contact your administrator.
2.  Answer your security questions.
3.  Enter a new password.
4.  Sign in as usual with the new password.

Reset local account password for Windows 10, before version 1803
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For versions of Windows 10 earlier than 1803, local account 
passwords can't be reset because there are no security questions. 
You can reset your device to choose a new password, however this 
option will permanently delete your data, programs, and settings. 
If you've backed up your files you'll be able to restore your deleted 
files. For more information, see Recovery options in Windows 10. 

To reset your device, which will delete data, programs, and settings:
1.  Press the Shift key while you select the Power  button > Restart 
    in the lower-right corner of the screen. 
2.  On the Choose an option screen, select Troubleshoot > Reset 
    this PC.
3.  Select Remove everything.