<a data-bind="attr: {'href': checkoutConfig.checkoutUrl}" target="_blank">Link</a>This will redirect to the checkout page by opening a new tab.
<a data-bind="attr: {'href': checkoutConfig.checkoutUrl}">Link</a>This will redirect to the checkout page without opening a new tab.
Other examples:-
checkout.baseUrl => {www.example.com}/
checkout.checkoutUrl => {www.example.com}/checkout/
checkout.customerLoginUrl => {www.example.com}/customer/account/login/
checkout.removeItemUrl => {www.example.com}/checkout/sidebar/removeItem/
checkout.shoppingCartUrl => {www.example.com}/checkout/cart/
checkout.updateItemQtyUrl => {www.example.com}/checkout/sidebar/updateItemQty/
checkoutConfig.cartUrl => {www.example.com}/checkout/cart/
checkoutConfig.checkoutUrl => {www.example.com}/checkout/
checkoutConfig.defaultSuccessPageUrl => {www.example.com}/checkout/onepage/success/
checkoutConfig.forgotPasswordUrl => {www.example.com}/customer/account/forgotpassword/
checkoutConfig.pageNotFoundUrl => {www.example.com}/checkout/noroute/
checkoutConfig.registerUrl => {www.example.com}/customer/account/create/
checkoutConfig.staticBaseUrl => {www.example.com}/pub/static/