There isare a lot of people who say that learning a new language with Duolingo is the worst idea that you can have.

However, I don't think that's true,. I think that the aim of Duolingo is to teach you the grammar and how to read in your target language in a funnier way, which are essential abilities as a beginner.

If you want to learn expressions you should immerse yourself in the language and if you want a more deeper grammar explanation you should read a grammar book.

There isare a lot of people who say that learning a new language with Duolingo is the worst idea that you can have.

There is a person
There are people

However I don't think that's true,. I think that the aim of Duolingo is to teach you the grammar and how to read in your target language in a funnier way, which are essential abilities asfor a beginner.

"Funny" is used for jokes and humor.
"Fun" is used for things that are interesting and enjoyable.

funny -> funnier
fun -> funner

If you want to learn expressions, you should immerse in the language and if you want a more deeper grammar explanation, you should read a grammar book.

If you say "(adjective)-er", you shouldn't say "more."

If you have a statement starting with "if", you should add a comma after.

There isare a lot of people who say that learn a new language with Duolingo is the worst idea that you can have.

However I don't think that's true,. I think that the aim of Duolingo is to teach you the grammar and how to read in your target language in a funnier way, which are essential abilities as a beginner.

"funnier" while grammatically correct, might not be the best wording. Perhaps "to make reading in your target language more fun"

However, you shouldn't use Duolingo as your only resource to learn your target language.

If you want to learn expressions you should immerse yourself in the language and if you want a more deeper grammar explanation you should read a grammar book.

"immerse" is usually either reflexive (yourself) or an adjective (I am immersed)

There isare a lot of people who say that learning a new language with Duolingo is the worst idea (that you can have).

However, I don't think that's true,. I think that the aim of Duolingo is to teach you the grammar and how to read in your target language in a funniermore fun way, which are essential abilities asfor a beginner.

However, you shouldn't use Duolingo as your only resource to learn your target language.

If you want to learn expressions you should immerse yourself in the language and if you want a more deeper grammar explanation you should read a grammar book.

There isare a lot of people who say that learning a new language with Duolingo is the worst idea that you can have.

is -> are: Pleural nouns get the "are".
Removal of the second that: Honestly, I think it's grammatical, but it feels weird to see two "that"s in one sentence to me.

However I don't think that's true, I think that the aim of Duolingo is to teach you the grammar and how to read in your target language in a funniery way, which are essential abilities (or skills) as a beginner.

funnier -> funny: "funnier" is relative so it begs the question "funnier than what?"

However, you shouldn't use Duolingo as your only resource to learn your target language.

If you want to learn expressions you should immerse in the language and if you want a more deeper grammar explanation you should read a grammar book.

more deeper -> deeper: "deeper" is already relative so you don't need "more". It's either "more deep" or "deeper" and typically the former is only prefered when "-er" is ungrammatical, like if you wanted to say something is "more grammatical".

There isare a lot of people who say that learning a new language with Duolingo is the worst idea that you can have.

However I don't think that's true,. I think that the aim of Duolingo is to teach you the grammar and how to read in your target language in a funniermore fun way, which are essential abilities as a beginner.

"funnier" is usually used when talking about something comedic.

However, you shouldn't use Duolingo as your only resource to learn your target language.

If you want to learn expressions you should immerse in the language and if you want a more deeper grammar explanation you should read a grammar book.