Highly recommended read.
Where ever you are in the world right now, what ever the circumstances, We hope you are ok. 
https://www.goodreads.com/book/show/43352954-this-is-how-you-lose-the-time-war
Great concept, execution, maybe not so much.
https://seeken.org/how-to-deal-with-idiots-and-jerks-5-simple-tricks/#:~:text=Don’t%20hyper%20yourself%20by,they%20and%20their%20words%20don
Knowledge is power, be cautious always.
https://www.hotspotvpn.co/post/social-engineering-playing-with-mind-games
https://www.tecmint.com/mysql-mariadb-security-best-practices-for-linux/
https://mariadb.com/docs/deploy/best-practices/
Feeling at odds dedicating resources to MariaDB certification, when there’s other platforms with Exam options on Pearson Vue.
https://www.businessnewsdaily.com/10734-database-certifications.html
Depending on the demand, this may vary. MariaDB is quite prolific in the web hosting space at time of writing.
Redhat have a clean, comprehensive guide to MariaDB deployment.
https://access.redhat.com/documentation/zh-cn/red_hat_enterprise_linux/8/html/deploying_different_types_of_servers/using-databases
We highly recommend Threatpost, below is a ranking of 45 of the best sites for IT security news.
Microsoft Zero-Days, Wormable Bugs Spark Concern
https://blog.feedspot.com/cyber_security_news_websites/
There a myriad of various news sites and forums and honestly the more you read, the better the overall scope and clarity in perspective.
A common grevieven is the less then stella audio playback quality.
Below are guides to improve the playback quality.
At your own risk, blah, blah, you’re adults.
https://medium.com/@gamunu/enable-high-quality-audio-on-linux-6f16f3fe7e1f