The idea behind this is to stop WordPress from loading your plugins while you check for errors. Open your website again, and if it’s back online, a plugin was the cause of the WSoD.
From here, rename your plugins-deactivated folder back to plugins – which will reactivate everything – then follow the above renaming process for each individual plugin within your plugins folder, one by one, until you find the one that causes the WSoD.
Once you’ve identified the faulty plugin, you’ll need to decide if the plugin is vital to your workflow. If it is, re-download the latest version, try reaching out to the developer for advice, or replace it with an alternative. Of course, if the plugin isn’t vital, trash it.
It’s worth mentioning that there could be more than one plugin causing the WSoD, in which case, you’ll have to identify both via the above approach.
If your WSoD woes are not memory or plugin related, the next step is to rule out your themes. Fortunately, this follows the same process as plugins – namely navigating to wp-content, and renaming your current theme’s folder to force WordPress to load the default Twenty Sixteen theme: