I am wondering that all of you are teachers and native speakers but why you have conflicting ideas let alone those who aren't native ones.
Best regards!
There are many varieties of English - British, Irish, American, Canadian, Australian, New Zealand, to name but a few of those that are the first or only language in the countries in which they are spoken, Within these varieties are other varieties; What we loosely call 'British English' includes Scottish and Welsh English as well as the English of England, to say nothing of the many dialects.
Each of these varieties has what we might call a 'standard' version, generally recognised as the form which educated speakers use in moderately formal writing. These standard varieties are very similar indeed to each other, and speakers of one variety generally have no difficulty in understanding speakers of another, though there may be occasional misunderstandings. There may be differences in pronunciation (AmE and Br E 'herb', for example), grammar (modals cannot operate together in English English; they can in some varieties), vocabulary (AmE and BrE 'subway') , usage ('recreation' and 'relaxation' appear not to be countable in AmE, though they can be in BrE), etc.
As the standard varieties of English are very similar, the advice given in this forum is generally applicable to most or all varieties. Sometimes we mention that what we are saying is true of only one variety, Sometimes we don't know - until yesterday, I did not know that 'recreation' and 'relaxation' were always uncountable in AmE.
You can see from our personal details which variety of English each of us uses. Our regular posters include speakers of BrE, AmE and AusE, and speakers of other varieties come in from time to time. This means that you will soon discover if there are any significant differences in usage, and you can decide for yourself which you prefer.