What the heck is an Infinitive?

Some of these grammar terms feel like their own language, but i'm here to make it easier for you!  An infinitive is a verb.  It means it is not conjugated.  “Huh?” For example “SER o no SER” means “TO BE or not TO BE”… SER is a verb, but it is not conjugated.  It does not have a subject. A conjugated verb DOES. Like I AM Brittany. I AM is conjugated for ME! YOU ARE a Spanish student.  YOU ARE is conjugated for the subject, YOU. SER is just TO BE. I would never say I TO BE Brittany.  NO! I would say I AM Brittany.
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So the conjugated verb has a subject.  The un-conjugated verb is called an infinitive.  An infinitive always starts with TO in English.  Like: to walk, to talk, to read, to drink, to eat.  In Spanish it always has the ending, -AR, -ER, or -IR.  Hablar, comer, beber, caminar, leer.  So the -AR -ER and -IR endings in this case mean TO.  Once you understand what an infinitive is, you can start spotting them and listening for them in the language! I hope this helped clear things up for you.  Keep practicing and moving forward!
​¡VAMOS!