Is new domian redirection to old domain make risk for my site ?

[MidnightShop79]

i have site with Da about 30 and i have many project on it

if i register a domain for each project and after that redirect to my site

is that bad for my site and my site seo ?

for ex:

my project is : mysite.com/helloword

i register helloworld.com or domain like that helllo-world.com and redirctet to mysite.com/helloworld

[pilesofpillows]

I don't think there is much risk in this unless they are expired domains with a bunch of spammy links pointing to them. However, I don't imagine you will see much if any ranking improvements from doing this.