capital letters

CAPITAL LETTERS ARE USED with:

• Countries, languages and nationalities: Spain, Spanish, English, German, New Zealand, Portuguese, European, American, Asian…

• Proper nouns, place names (Jane, John, Oxford University, Denver, Microsoft, Everest, Sahara)

• Acronyms (BBC, DfE, DIY)

https://www.lexico.com/grammar/using-capital-letters