This is the bored Wikipedia definition, but in simple words,
meta tags are a piece of code that defines standard information about your web page, so other sites like Google, Facebook or Twitter, can display it nicely. They also are helpul for search engine optimizacion aka SEO.
Once you have your meta tags generated, you should include them in the source code of your page, between <head> and </head> tags, and yes, you need to have at least a basic HTML knowledge. HTML is fun, if you don't believe it, ask any webmaster ;)
(Copy function only works in desktop computers)
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