HOW do you navigate the Linguistic world of AI, CHARLATANS and PIRATES? Be careful out there: Unfortunately, (and increasingly) videos on youtube use AI generated voiceovers with terrible errors of pronunciation, syntax, emphasis, etc and the subtitles are mostly symantically meanigless, too, even for well produced content. And a large array of 'educational' websites that I visit for research and general interest present low quality texts, exercises or test papers which are incorrect in various ways, such as the way they phrase sentences, build syntax, suggest as appropriate forms of communication tone which are not, so. Look at the source: If the website is based in the UK, that would likley but not always be better than one from Spain, for example. Look at the publication date If you are considering buying textbooks (or using online versions to work towards exams) check for a recent date of publication/printing. Sometimes I have seen very old versions for sale. Also; believable, official-looking but pirated, printed books which are actually made from pre final-editing versions without a publication date, which implies the data files were stolen and distributed before the final checking was done and sold on to pitrates unaware and unconcerned about the errors. - Good luck.