Shipping methods are managed in Stores > Configuration > Sales > Shipping Methods.
Flat Rate Shipping Method
Flat Rate is the standard Magento 2 shipping method that can be applied per single item or per order regardless of the product attributes such as size or weight etc.
Set the values in each field as per our requirement.
Free Shipping Method
Free shipping is the most popular and customer-attracting type of shipping used in Magento 2. It is a great way for merchants to offer customers free shipping based on the minimum order amount and set up cart price rules if the conditions are met.
Reference link: https://magefan.com/blog/configure-magento-2-shipping-methods