I used Ancestry for a couple of years but ran out of money for the $300 a year
Great site. I love the newspaper articles, saves a lot of wading through archives in RL. You can also search censuses and some birth/death records of other countries.
You can also use familysearch.org (free) - lots of info but the info is entered by regular people. So it can sometimes be incorrect. Saw one guy who traced his lineage back to Adam and Eve
I do like the site for Social Security, death/birth/census info and use it as a starting point then go on to verify it.
For example, I have a dead end on a great great grandmother. Guess how many Mary Clarks there are in the history of the world!
Found one that looked promising but it shows Mary as being 5 years old when she gave birth to my great grandmother (whos dates are verified), so that is not correct. Not sure why the person posting it didn't catch that error. But since she didn't, the entire tree before that gggrandmother is suspect.
However, I have found many that are correct, so it is possible.
My local county library has free online access to several databases. I use the census database mostly. I believe the US census goes back to 1790 or so but not all regions are listed. Women and children aren't listed with their own names until about 1860 if I remember correctly. Its been awhile since I have looked at my stuff.
Genealogy.com and Ancestry.com both have community boards where anyone can post questions or search (free) for info others have posted.
I also will simply google an ancestor's name. Often it will lead to a website by someone who is working on the same line or has a link to the line.
Genealogy research really is like a puzzle and is completely addicting!