Learning Kanji looks so hard.

I'm going to learn Chinese from this Sunday, so I bought a textbook that teaches how to write Kanji.
I thought that learning English was hard for me but learning Chinese is even more difficult, especially Kanji, for people who never studied it. We have studied Kanji since elementary school. I don't want to study it from scratch now that I'm older. It looks so hard.

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Almost perfect! Some of my corrections are just nitpicks but I'll explain.

"I'm going to learn Chinese from this Sunday. So I bought...."

We don't normally start a sentence with "so" when explaining the reason for something. You should use it in a compound sentence instead.

If you do want to write it as two sentences though you could say:

"I'm going to learn Chinese from this Sunday. Because of this I bought..."

"I bought a textbook that says how to write Kanji."

Small correction on text book - textbook should be one word.

But this sentence sounds like the textbook just says the words "how to write Kanji" on it. If you want to say that the book tells you how to do something, "teaches how to write Kanji" would be the sentence to use.

Also I changed "which" to "that" - This is just a nitpick, saying "which" here is perfectly fine, but saying "that" instead sounds a lot more natural.

"I thought that learning English is not easy for me..."

In this sentence you don't have to say "that". "I thought that learning English..." makes perfect sense, but "I thought learning English..." sounds a lot more natural.

Also because "thought" is a past tense verb, "is not easy for me" should be past tense as well. But I changed it to "hard" because it sounds a lot more natural. "I thought that was hard, but this is even harder" is something I'd hear people say a lot, but I've never heard anyone say "I thought that wasn't easy, but this is even harder".

"but Chinese is more difficult because..."

I changed that to "even more" because it sounds a lot more natural.

I'm struggling to learn Japanese Kanji right now though so I know how you feel!　お互い、頑張りましょうね！

"Wood can be used to make furniture" would be correct. "Wood can be used for making furniture" is something people might say in casual speech, so you could get away with saying it, but it might sound a bit odd.

Both are pretty much okay, but "I'm interested in dance" sounds a bit more formal than "I'm interested in dancing". "I'm interested in dancing" makes it sound more like a hobby. "Dancing" would be a verb here. "I'm interested in dance" makes it sound more like an artform. "Dance" would be a noun here.

"He could have been Prime Minister now if he hadn't decided to leave politics." This sounds like he had the potential to be Prime Minister. He had the ability to become Prime Minister. Whether or not he actually became Prime Minister though would be up to him. "He would have been Prime Minister now if he hadn't decided to leave politics." This sounds like he would definitely have become Prime Minister if he hadn't left politics. "He might have been Prime Minister now if he hadn't decided to leave politics." This sounds like there was a possibility that he would have become Prime Minister, but you don't know for sure whether he would have or not. It basically means the same as "could have", but the sound is a little bit different. "Could" means the potential exists. "Would" means it was definitely going to happen. "Might have" means it may or may not have happened. So yeah, pretty much the same as "could".

Reading

Hello everybody,

I want to improve my English reading skills, so I have started reading an English book. The title is Eleanor & Park and it's written by Rainbow Rowell. *I can say to you, this book is lovely and it's about love. The story is not very innovative, but the way the story is written is so good! So if you want to improve your English and while you're improving, also have fun, read this book! It's amazing!

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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!

"On" sounds more natural here, but when speaking casually I think a lot of English speakers might still say "for" in that sentence. So you could get away with either. "On" would be the proper word to use though.

They're both correct but they mean slightly different things. "How about preparing some gifts? It'll make games more exciting." - This could mean either that the actual preparation of the gifts will make games more interesting, or that the gifts you're going to buy them will make games more interesting. Depends on the context. "How about preparing some gifts? They'll make games more exciting." - This one means that the gifts you're going to buy them will make games more exciting, but you can only really use it if you already know what those gifts are going to be. You won't know if they have anything to do with the games otherwise. I'd probably use the first one more commonly.