I've been at this over 20 years, since the birth of my son.  The way I do this has changed considerably, not only because of technology.  My interests have gone way beyond just my son's ancestry, though that's quite a task [Scotland, England, France, Germany, Holland, Mauritius & South Africa].  The degree of rigour varies with how important it is to me.  So there will be errors, thousands no doubt.  Caveat lector.

Of course, additions and corrections most welcome