Both are correct. A lot of times with certain prepositions, they can be interchangeable and both considered correct. You will see both of them regularly. https://www.collinsdictionary.com/dictionary/english/second-nature As you get better at English, you will start to see how flexible the grammar can actually be. Not always, though. www.italki.com/garyalexander

The second sentence is right.

thanks a lot

Thanks a lot

"To" is what I would say.