Story writing:-
If you want to improve your writing skills than writing a story is the best thing you can do. Because all the things from Grammar to spellings fall in it. It not only tests your writing ability but also your creativity. So here are some tips:-
1. Spelling
A story with so many writing mistakes can never be enjoyed. Even we know the spellings of all the words we can still make mistakes. Because while texting someone we don't care about the spellings and it becomes a habit. A good story with so many typos is just like a speed tracks with so many bumps. You can't enjoy the ride at all. The best way to eliminate this fault is just turn your "auto-correct" in keyboard settings. It automatically corrects all the typos and you don't need to read very carefully word by word. Even if you read with full concentration you can't point all mistakes. Because our brain aren't good at this. While turning on "auto-correct" is an easy method.
2. Grammar
Of course I can't teach you all the grammar. Its my personal enemy as well. If you want to improve your grammar as well as your writing skills just go to a bookshop and buy English Grammar book of mdcat. Just give a read to 10 rules everyday and in a month you will be able to write without grammar errors (or very less errors atleast). But even if you make such mistake its OK. Because we aren't native speakers. A little bit mistakes are fine but a lot of mistakes can divert reader's attention. If you just want to improve your writing skills and Grammar is of no concern for you just type your story in MS word and in the end check "spellings and grammar". It will point almost all of your grammar mistakes as well.
3. Introduction of characters
Whenever a new character enters the story try to make a sketch in the reader's mind of your character by words. For instance saying, "Mr. Safeer entered the room" isn't enough (when this particular character appears first time in the story). Write instead, "Mr. Safeer a blonde man in his twenties with no hair at all on his head entered the room wearing a black jacket with brown jeans". And not only physical appearance but also describe his nature such as, "his face looked really humble but anger dripped down from his eyes which were larger than usual".