Using a Google Login to Create a Sign an Page

One, i can use a gogle login so that y users can just use it, unsign and using gogle. Or two, i can do my own signand page with my own technology. This is where you detail the solution, explaining the cor capabilities. Be as detailed as possible, because this really tells how the product has to be built. The wat is section, for example, i may even detail out information like single click option is visible at the top of the age with help right next to it. Right?...