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Will this be on the same domain? If yes then: make sure you verified all properties in GSC: www and non www of your domain fetch all links from Google search results with some tools like scrapebox scan entire website page by page and make a list of all pages/posts/etc (you'll need them later) go to wp dashboard - settings - general and change there from non www to www wp address url and site address url (probably you have to login again after) empty cache if you have cache scan again your entire website and check if there're links pointing to non www version of your domain (probably will be redirected automatically but save this list) correct them - in most cases they were manually added combine lists of links: from Google and from your scan; remove duplicates; make sure all are non www do 301 test with tool like scraming frog to see if all non www pages are redirected with 301 to www pages without errrors combined list of links sent to reindex to speed up the process - you need some indexing software or service no need to set preferred domain but if you wish?

In general, if you are writing about information that is commonly available on many websites, then that information can be considered to be "common industry knowledge" - and most authors would not use citations.   Facts that would likely be in the body content of an introductory college textbook would also be considered as "common industry knowledge". However, if you are stating specific information that might only be available from one or a few sources, then a citation is a proper thing to do.  Also, if you are giving facts or advice that you feel it is important to give others credit or responsibility, citations are good there too. The above is what I generally do for writing content for a specific industry.  I also tend to use more citations where parts of my writing approach the limits of my firmly confident knowledge. You are obviously doing research and visiting sites that you think would be superior to your own.  What is their practice on citations?  That might be a guide for you too.