Do I need to block my cart page in robots.txt?

[EcommerceSite]

I have a site with woocommerce. Do I need to block the cart page?

[ofw12387]

Well, i would do it! So you will sure that google will not index this useless links

[Hutch42]

It is best practice to use nofollow tags and your robots.txt to keep search engines out of not only e-commerce pages, but also any areas that require a log in (such as a customer profile page or shopping history).  You want to do this so that they do not accidentally index pages that will redirect users who aren't logged in or create a weird/negative experience for them.