The requirements for product safety are directly related to your product. If you have a product with hazards (such as a battery with a hazard of shocking someone while using it) then you need to identify these hazards and decide what needs to be done (such as warning labels, protective covers, etc.) If your product does not have any safety hazard then you could simply demonstrate that this has been assessed and therefore no actions are required.
Continual improvement is the incremental, planned changes that you implement to make things better in your organization (as opposed to continuous which means everything is improving all the time). This is to be applied to your products and service and the QMS to meet customer needs and enhance customer satisfaction (clause 10.1) as well as looking for opportunities to improve other aspects of the QMS not directly related to customer requirements or satisfaction (clause 10.3). In many ways one of t he biggest ways that a company demonstrates continual improvement is through the use of we planned quality objectives which give a target for improvement and follow through on plans to achieve them.