A coding error dubbed The Riddle has been uncovered in the popular DBMS Oracle MySQL, the issue can be potentially exploited by attacker powering a man-in-the-middle attack to steal usernames and passwords.
While administering a Drupal 8 CMS, you may have of noticed when a change to an imagestyle is made, the change to the related content is not immediately reflected on the site (eg: metatags) . The following knowledgebase is a workaround for this issue.
If you've ever maintained a Drupal website that contained images or files, you would at some point come across this error when Drupal's cron process is run. Here is a fix to get around this issue.
At some point in your life as a Linux Administrator, you are going to have to deal with installing and maintaining a MySQL database. The following blog links to a website which outlines how to install and add data into a MySQL database.