I've used https://www.familysearch.org/ in the past and found it very good. It's run by the Church of the Latter Day Saints but you would never know that going through the site. They don't try and convert you or anything..... My last name is Duguid, so it was easier to find relatives with having a less used last name. Not sure how you will go if your last name is Smith or Jones... I managed to go back to the 1600's just using free sites.