Reading

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Very good, only a few corrections to make.

Whenever you use 'a', before a word that begins with a vowel it changes to 'an'. So where you would say "A book", because book begins with a consonant, you would say "an English book" because English begins with a vowel. It's because it's much easier to say.

* "I can say to you" is a perfectly fine thing to say, but "I can tell you" is a common English expression. So it might sound better to say "I can tell you, this book is lovely and it's about love". "I'm telling you" is very common as well, but "I can tell you" sounds softer, so it depends how you want to sound.

That sentence wasn't really the right place to use a semicolon. Honestly most native English speakers don't really even know how to use semicolons, but that was a place to put a comma instead.

"How the story is written is so good" - I'm not really sure how to explain why this doesn't really sound right. I guess it's because 'How' isn't a noun, and 'The way' is. Since you're describing 'The way' the story is written it sounds a lot more natural to use that. 'How' is more of a describing word. I think that's why, anyway. I might be wrong.

"Also having fun" - You're talking here about something you're going to do at the same time as "Improve your English". You're talking about improving your English in the future tense, so "have fun" should be written in future tense too.

"It's is amazing!" - "It's" is a shortened version of "It is", so you don't need to say "is" after "it's".

I could understand what you're saying perfectly though!