need & need to

khoshtipWhat is the difference between "need" and "need to"?

Both of your examples have the word to. Are you sure that the second one isn’t a mistake?

What is the difference between "need" and "need to"? For example if I say I need to read this book, it's a correct sentence.
But if I say, I need to that book, it isn't a correct sentence, but why? Because it has no meaning.
'I need that book.' has a meaning.

Yah guys! The second one is incorrect. The structure is: need to do something or need something...

I said the second one is not true, that is, it's a mistake. But why?

khoshtipI said the second one is not true, that is, it's a mistake.

See the post above, and note the replacement of true with correct.

Your second example seems to run counter to your original question, so I wondered whether it was really what you meant to write.

I need to do something or I need something.
The "need to" is always
used together with a verb

Thank you. It's really what I was looking for. Correct explanation.