In the replies that follow are a lot suggestions on how to use these and other records.
Not to belittle your ability, but some of the basic books on how to do genealogy in general discuss these types of sources, and more, and how to use them. None of us know everything, or are familiar with all types of sources, and often we benefit by reviewing some of the basics.
Go to your local library and look at their “how to” books. Your local bookstores likely have more recent books. Used bookstores typically have a genealogy section, but things there can be a bit dated. Books on using the traditional sources are probably ok, but the internet related ones can be really out of date.
I do not know what country you are in, or what ethnic group you belong to, but there are often books specific to countries, or religions, or ethnicities. These can provide some guidance that the general references do not.
Not everything is online, but there is a lot. Look at local archives and national archives, these can be much better that some of the general sites.
Not all websites are free, but many are. You can use some of the subscription sites at the LDS Family History Centers for free.
Best of luck!