Calmed down a bit now so - addition to the above - authenticating is not something you can learn from reading a few (or even a few hundred) internet articles/pages. Most of what is on these sites is outdated garbage, unsubstantiated rumor, wishful thinking, and urban legend, written largely by counterfeiters to try to "validate" their trash.
You have to have bought, sold, and collected authentic Prada for many, many years. You have to have knowledge of every different Prada range issued in every different geographical locality. You need to know what logos go with what styles; what linings go with what exteriors; which "tweaks" Prada have used (for their ever changing logo) on which styles; which leathers belong to which range/style for which year and which season; which colors belong with which style/range/season; which zips and tabs go with which style/range/season. You need to spend literally hours trawling counterfeiters' sites to see what trash they are producing. You need a library or a collection of thousands of photos of every aspect of every collection. It also helps to have one or two friendly Prada SAs on your side as well.
And you really don't need newbies posting willy nilly without first reading through the site, just a little bit, to discover that there is an etiquette to posting here.
Sermon over.