Travel from Hong Kong to China and after that Macau and again Hong Kong

Hello guys we’re planing trip from Hong Kong to Guangzhou to Macau and after that again Hong Kong. Do we need to apply to get Visa or we can travel from Hong Kong to China on 30 days without Visa. We’re tourist from Poland and we will be grateful for your help. We are reading about that in embassy site but we don’t know how to interpret it.
Any help will be appreciated;))