paid and not paid Backlinks

[NeverTie]

Hello to all,

So I have read many post that say not to have paid backlinks, that it is a not a good idea and Google does not like them. I am still trying to figure it all out but how does Google or any other search engine know what is paid and what is not paid backlinks.

and also how many backlinks should one have for a website? I have seen something on the internet that one website had 62,000 backlink and I am unsure if that is true but that should in fact do some good if true.

Thanks in advance