Watch short movie or video snippets that are English on Facebook. Because its short , you will focus on the information better. Then practice speaking with someone.

Grammar first. Practice speaking with another user is the fastest way to improve. Because you can listen to how they talk and you can correct your mistakes. Then upgrade to improving vocabulary.

Different meaning. I've grown fond of you means I like you as time passes. I'm used to you means I'm comfortable around you. It does not necessary mean I like you. E.g. I used to her bad habits.

It can extract oil from coffee beans.

Many new products are developed each year. Light bulb(s), camera(s), airplane(s), and telephone(s) were invented by scientists and inventors. Laptops, smart phones, and tablets were invented after countless of hard work and experiments. However not all products were developed by hard work. Some products were discovered by accident. Alexander Fleming discovered Penicillin while he was working on a strain of bacteria.

Hi i'm new here. I'll be happy to practice English speaking with you. 

Correct: The ball hit him so hard that he almost fell into the river. The word 'heavy' is incorrect because of the preceding word 'hit' . You can say 'I hit you hard'. You don't say 'I hit you heavy'. The word 'heavy' can be used in e.g. 'I hit you with a 'heavy bat'.