Redirect multiple domains to a primary domain

[globotec]

Hello that such I make the following query imagine we have three domains on the same thematic or category primary domain: domain-antiguo1.com (3 years) (200 Backlink), domain-antiguo2.net (10 years) (1000 Backlinks) and domain-antiguo3.com (6 years) (500 Backlinks) and decide to redirect all these domains favorite one: domain-principal.com

The three domains registered refeccionar this google webmaster, has its respective income sitemap and google webmaster area change of address to the main domain

the three domains are my property

It would have a penalty for doing this practice?

[OlegKorneitchouk]

I wouldn't redirect them all to the homepage as this is a common blackhat technique and G may think something fishy is going on. If you can redirect individual pages to relevant/similar pages on the new domain (and all the general ones redirect to the homepage), then that would be a very good strategy.

Just make sure that the links to the old sites are natural/healthy. If they are bad, the effects will transfer to the new domain as well.