"Este" "Esta" "Estan"
Welcome to the forum. I will try to answer your question, but I fear you have left off some tildes, otherwise known as accent marks. This will make a big difference in my answers.
For instance, esta is the feminine form meaning "this".
But está is a form of the verb estar in 3rd person singular, meaning he/she/it is.
Este is the masculine form meaning "this". It's also the word meaning "east".
There is no word estan as far as I know, but there is a word "están", which is a form of the verb estar, this time in 3rd person plural, meaning "they are".