many plural nouns do end in и. If you look at the tips and notes section of the Plurals lesson, it tells you how endings change between singular and plural for different types of nouns: https://www.duolingo.com/skill/ru/Plurals
Not all nouns that end in и are plural though as it is also the ending of some feminine nouns in the singular dative, genitive, or prepositional case
It is very hard to explain all endings whne asking different questions and using different prepositions. Use the internet to learn when and where to use a certain ending. In russian there 6 'categories' (not really tge right word, but I do not know the right word), how the questions and prepositions with different endings are separated: именительный падеж, родительный падеж, дательный падеж, винительный падеж, творительный падед, предложный падеж.
It is very hard to explain this and I hope you understand me and my explanation and don't understand wrong
"вот" is literally saying here is/here are. If you translated "my plates are here" it would be мои тарелки здесь. Remember вот describes here in general. While здесь describes a place
God bless they taught us this usefull phrase, how would you comunicate otherwise. Jajaja
If you want to hear better audio for тарелка, you can check Russian викисловар: https://ru.m.wiktionary.org/wiki/%D1%82%D0%B0%D1%80%D0%B5%D0%BB%D0%BA%D0%B0
or Wiktionary in English: https://en.m.wiktionary.org/wiki/%D1%82%D0%B0%D1%80%D0%B5%D0%BB%D0%BA%D0%B0
If you notice, plates ends in и instead of ы like the other fem nom plurals because к is one of those special letters you never put a ы after.
Как вы учите этот русский? Вам памятник при жизни за старания надо поствить всем!)