There is a good set of Linode articles that should guide you along the way whether you are using NGINX or Apache.
https://www.linode.com/blog/security/how-to-keep-wordpress-secure-the-basics/
https://www.linode.com/blog/security/how-to-keep-wordpress-secure-advanced-steps/
https://www.linode.com/docs/guides/securing-your-server/
https://www.linode.com/docs/guides/linode-manager-security-controls/
Also, @PhaseLockedLoop has been posting a series of Web Hosting and Housekeeping How-Tos that may help as well.
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