Explanation
To configure the checkout time-to-live, an admin can update the CheckoutTimeToLive and CheckoutValidAfterDate properties on a Webstore. These properties determine how long a checkout session is valid for a user after they initiate checkout or after they modify their cart. The CheckoutTimeToLive property specifies the number of minutes that a checkout session is valid after it is initiated. The CheckoutValidAfterDate property specifies the number of minutes that a checkout session is valid after it is modified. References: Checkout Properties

To ensure that guest users have read access to the Product object, an Administrator should modify the guest user profile to provide access to the Product object. The guest user profile controls what guest users can do and see on a site1, 2. By default, guest users have read-only access to some standard objects, such as Account and Contact, but not to custom objects, such as Product2. Therefore, the Administrator needs to edit the guest user profile and assign the appropriate object permissions for Product2. Reference: Salesforce Accredited B2B Commerce Administrator Exam Guide, Set Up Guest User Access for Your Site

To debug a flow and watch all the variables changing as the checkout process is executed, the developer needs to enable two features: show the details of what is executed and render flow in Lightning Experience, and show the details of what is executed and render flow in Lightning Runtime. These features are available in the Debug Options dialog box in Flow Builder, and they allow the developer to see the detailed information about each element, resource, and variable in the flow as it runs. The developer can also use breakpoints to pause the flow execution and inspect the variable values at any point1. Running the latest version of each flow called by subflow elements is not a feature that affects the display of variables, but rather a feature that ensures that the debug session uses the most recent version of any subflows2. Setting up a debug log is not a feature that can be enabled in Flow Builder, but rather a separate tool that can be used to monitor the events that occur when a flow runs3. Reference: Debug a Flow in Flow Builder, Flow Debugging, Debug Flows with Debug Logs

Tiered Pricing tables can be input in two ways:
JSON text field: Tiered Pricing tables can be input as a JSON text field on the Price List Item. This allows you to define complex Tiered Pricing rules with multiple tiers and conditions.
Visualforce component on the Price List Item: You can also use a Visualforce component to input Tiered Pricing tables. This gives you more flexibility in how you define and display your Tiered Pricing rules.

Explanation
An admin should keep in mind that only 50 categories can be localized per language prior to implementing a customer's category hierarchy for a multi-language site. This means that if there are more than 50 categories in one language, some of them will not be translated into other languages on the storefront. References: Localize Store Categories