Reading The Simple Path to Wealth

I’m 36 new to investing into a Roth IRA.

When I first looked into it I thought keep it simple all into VOO.

I’ve asked a few questions on here in the past weeks and people suggested I read a couple books to learn more because I didn’t know anything about investing again I want to keep it very simple.

Im more than halfway through the book and he’s all for VTI so I thought okay maybe I’ll just do 5k into VTI. But now I’m reading that he’s for VT.

Essentially is either fine? I want to purchase before April 15th.

What do other books recommend?