I'll answer you later or I'll answer to you later?
which one is correct and if both are correct, is 'to' optional in this sentence?

Thanks in advance! Your comments always help me a lot with improving my English!

Question

I'll answer you later or I'll answer to you later?
which one is correct and if both are correct, is 'to' optional in this sentence?

Thanks in advance! Your comments always help me a lot with improving my English!

Answer

'I'll answer you later' is the correct sentence. It wouldn't be correct to use 'to' here. The verb 'answer' takes a direct object.