"This person eats bread."
Translation:Этот человек ест хлеб.
There are some rules of thumb: feminine nouns mostly end in "а", "я", masculine in a consonant, neuter in "о", "е", "мя". But of course there are exceptions to this rule. Nouns that name people or animals have gender of a person/animal they name: дядя (uncle) is masculine. And also there are a quite a few feminine nouns that end in "ь"
Есть is infinitive form of the verb (to eat). Я хочу есть - I want to eat Она любит есть - She likes to eat Also есть is like there is В холодильнике есть еда - There is some food in a fridge And we can say this word in a phrase with have got У меня есть яблоко - I have got an apple
Ест is Present form of the verb есть (to eat) for the 3rd Singular form of the noun Обычно он ест мясо - He usually eats meat Сейчас Женя ест фрукты - Jane is eating fruit now