The documents you find there are authentic and many historical records are to be found as well. You need to be careful about taking family trees that are pulbic there as accurate, since many people just assume that a tree is the same as theirs because of similarities. Many trees there are completely unsourced. Meaning that the researcher does not have any birth or census docus,etc. You need to source your tree or "prove it " as you go along. You can begin at ancestry by starting a "private " tree which only you can see as you work on it and then you can make it public if you want. All genealogy info needs to be taken with a grain of salt unless you have the records or it comes straight from ggggrandmas bible.