You are already playing online and watching chess videos, so you know how the pieces move, probably have a good idea about their relative strengths and values and are beginning to get an idea of how to co-ordinate your moves to try and achieve mini-plans.
What should a beginner focus on (Think about openings, end games, ways
to mate ETC.)
Definitely the first thing to learn is ways to mate. If you don't know how to finish your opponent off then you can only win if your opponent resigns or by luck. Start with Queen and King versus King, then 2 Rooks + King versus King, then one Rook + King versus King, then 2 Bishops + King versus King.
Next I would spend some time learning a couple of King Pawn openings, something like Ruy Lopez or 4 Knights for the first one just to learn about developing the pieces and then the Kings Gambit to learn about the fun of just attacking your opponent!
The third thing I would do is study tactics and combinations. Learn about forks, pins, skewers, overloading defenders, stuff like that. The best way to do that is to work from a book with lots of combinations.
Also I was wondering if anyone an easy way to learn the chess
notations, i get how the squares are lined up and everything but i
need practice(maybe software or a paper method anyone knows of).
You are definitely going to need this at an early stage because the other learning stuff is going to come from reading books.
One possible way to start is to find questions and answers in this forum where extracts from games, whole games, example moves and solutions are given. These are given in diagrams which play out the moves which are written written alongside. Here is one recent example - Why does the Hyper Accelerated Dragon avoid the Rossolimo?.
By all means use the autoplay features to scroll through the moves but then set up the position on your board with your pieces and physically play through the moves. The position on your board when you have finished should match the position on the screen board after you have scrolled through the moves. If it doesn't you can scroll back through the moves and undo the moves on your board to see where you went wrong.