How To Update Your WordPress Website, Themes and Plugins:
Before updating WordPress version software, BACKUP your files. (Wp-db-backup Plugin Needed or some other backup plugin)
In the dashboard, go to:
Tools, Backup, Click/Check available radio buttons on right (square boxes),
Select “Save to server” button, and Click “Backup now” button.
Once that is finished, DEACTIVATE ALL PLUGINS!!!!!!!!, then you can proceed to UPGRADE AUTOMATICALLY your version of WordPress.
Afterward, don’t forget to REACTIVATE all your plugins.
Always check your website’s appearance after you have taken these steps.
If you need to Update your Plugins:
Go to your “Plugins” page from the Dashboard Menu, Select all plugins that need updating and use the drop-down “Bulk Actions” menu above to select “Upgrade” and click the “Apply” button. You will be taken to a page that confirms all plugins have been upgraded.
If you need to Update your Theme:
You may want to deactivate all plugins (I have never had any trouble without deactivating, but you can’t be too careful).
Click on the Dashboard Menu “Dashboard” (all the way at the top of the left-hand menu). Click on “Updates”. Select the Theme you want to update and click Update/Apply. Afterward, you may have to upload your header again using Filezilla or another FTP upload program.