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While trying to install SSL certificate if you come across the error "Problem binding to port 80: Could not bind to IPv4 or IPv6". First thing your try to do it to stop apache2 then try installing again. The screenshot below shows the error Stop the Apache2 and try again: Try installing the certificate again:

In the previous versions of Wordpress, we had the option to add files with Add Media button. But with the introduction of Gutenberg editor, the same button is missing. So now how do we achieve that with the new editor. Here is the solution. With Gutenberg comes the blocks and w ith blocks, you can insert, rearrange, and style multimedia content with very little technical knowledge. Instead of using custom code, you can add a block and focus on your content. To add a file, click on add block and select from the numerous options. There are two ways to add a file as shown in the image below: Click on + sign to open the options:  Or click the file icon at the bottom:

If you see a warning message as shown below while installing Xampp then that is because of file permission. Important! Because an activated User Account Control (UAC) on your system some functions of XAMPP are probably restricted. With UAC please avoid to install XAMPP to C:\Program Files (x86) (missing write permissions). Or deactivate UAC with msconfig after this setup. To avoid the message and continue the installation you can either select installation folder other that C:/Program Files or you can set the User Account Control (UAC) as follows: 1. In windows search for UAC and go to User Account Control Setting. You will see default setting as in the following image. 2. Now slide the slider down to 'Never Notify' and hit OK. Now you can continue to install the Xampp. Please note to set back the UAC's setting to its default setting unless you are familiar with the apps you are installing.