Okay buddy, I'll explain it to you like you're five years old. So, Macedonian grammar is all about how to put words together to make a sentence. Just like when mommy or daddy ask you to put your toys away, they use words like "put" and "toys" and "away" in a certain order to give you a direction.
In Macedonian, there are different parts of speech, like nouns (which are names of people, places or things), verbs (which are action words like "run" or "dance"), adjectives (which describe nouns, like "red" or "happy"), and many more. Just like how you know different colors like red, blue, or green, and can put them in different orders to create a pattern or picture, in Macedonian you can use different words in different ways to make a sentence that makes sense.
Macedonian also has different ways of changing the words, even in the middle of a sentence, to show things like when something is happening (like past, present or future tense), who is doing the action (like the subject of the sentence), or who is receiving the action (like the object of the sentence).
For example, if you want to say "I love my puppy" in Macedonian, it would be spelled "Ја милувам мојот куче". "Ја" means "I", "милувам" means "love", "мојот" means "my", and "куче" means "puppy". Notice that each word ends differently depending on how it's being used in the sentence.
So, to sum up, Macedonian grammar is all about using different words (like nouns, verbs, and adjectives) and changing them in different ways (like adding different endings to show tense, subject, or object) to make a sentence that makes sense.