I went up to 400 in a single day out of sheer luck, then fell back down to 280 range, I have been doing a lot of tutorials and puzzles since. I am still unable to develop a strategy to handle my opponents. I still feel lost a lot.
Although, The tutorials have made me stronger and calmer I am back to 360. Question is what should I learn in order to improve further. The tutorials helped me go on a 9 game winning streak. That felt nice.
Also, how long does it take to become fluent in notation, (i.e. d4,e6,c9...blah), ?
learn a simple opening for white e.g. London, Vienna and for black Scandinavian, Caro kann
Also do tons of puzzles they help
I spoke to a beginning chess player the other day and was surprised to find that they didn't know the relative value of the chess pieces (knight=bishop=3 pawns, rook=5 pawns, queen=9 pawns - these are approximate but will do for now). You need to know this or you will lose a lot.