Before we start talking about articles, verbs, names, and so on, we need to make clear a thing: every noun in Italian is male or female.
You really should know if a word is male or female before you can say something about it. "this is a pen", like England said to Japan! XD
Pen is said penna.
Penna is female.
So, this will be questa, and a will be una.
This - is - a - pen.
Questa - è - una - penna.
Everything is female or male, remember it. That is not a thing I should say and I will be yelled at for that, but..
A word is male if it ends with "o" and female if it ends with "a". Basically ^__^"
Like, penna is female. Tavolo (table) is male.
Some nouns can be put in either forms, changing the last letter. So if you read gatto somewhere, you will know that is a male cat. Gatta is female cat.
Plurals of the nouns take the same rule:
If a word ends with "i", is a masculine plural. With "e", is a feminine plural.
Just remember it and you'll be fine.
A FEW WORDS TO KEEP TRAINED
SINGOLAR, MASCULINE: albero, oggetto, libro, cavallo, quadro
PLURAL, MASCULINE: alberi, oggetti, libri, cavalli, quadri
SINGOLAR, FEMININE: porta, casa, sedia, scimmia, giornata
PLURAl, FEMININE: porte, case, sedie, scimmie, giornate
These things will influence all the things we will study later on.