Well, one - and most straightforward way to use it - is to say - "on the right side you can see..." in Hebrew you say - בצד יָמִין תּוּכְלוּ לִרְאוֹת...
So, "right" - יָמִין.

Now, if you want to say "go right!" - how do you say it? Right, יָמִינָה! You see, we add an "a"*, and you even don't have to say "go" - it's implied. :)

*Why is that? because we have this somewhat archaic ending attached to signify the direction, the movement! It works only with several words - הביתה, החוצה, ימינה, שמאלה.

But wait, I just wrote the word "right" above saying
"right, יָמִינָה!" - what if I wanted to say it in Hebrew? Do I use ימין twice?!

No. In this case we are not talking about direction any longer... and we can't use (ימינ(ה! ;) We need another word! But which?