Wikitree is a great place to find info that has already been posted here by another member. As mentioned, using the search feature will help you find existing info that is on the site.
If you are trying to find info not currently on the site, you need to use other sources. As mentioned, FamilySearch is a great, free search engine, which may help you find new info. There are many other sources available. Some are free & others require a subscription. Ancestry & My Heritage are examples of subscription sites.
Sometimes trying Google will find you what you need.