Common phrases How to say Thanks:

Basic

Thank you! ...
Thanks!
Thanks a lot!
Thank you very much!
That's very kind of you.
You're so helpful.
Thanks for your kind words.
Thank you for coming here today!

Examples:
“I love your dress ; you look so beautiful!” – “Thank you very much.”
“Would you like a sandwich?” – “Oh, thanks. I would love one.”

Accepting thanks

That's all right!
You're welcome.
Don't mention it.
Not at all
It's nothing
My pleasure

Examples:
“Thanks a lot for your help, you’re very kind.” – “Don’t mention it.”
‘Thanks a lot for looking after the children .” – “It’s my pleasure. I love children .”
“Thank you so much. I couldn’t have managed without your help.” – “No problem.” short vintage dresses
“Thank you for such a wonderful gift.” – “You’re very welcome.”

Written, formal

Many thank for your email.
I was so pleased to hear from you
I greatly appreciate your kind words.
Thank you for your consideration.
I'm very thankful that you are considering my problem.

Very polite, formal

How kind you are to help me.
Thank you for spending time with me.
Thank you for talking the trouble to help me. I do appreciate it.
Many thanks for your assistance in our project.