I got my Hong Kong identity card, but it's not a permanent residence. I heard that you can travel to Spain indefinitely.

Nonsense, only EU passports can stay indefinitely in Spain

Hong Kong SAR passports are only exempted from visas for 9 days

Non-permanent residents can only apply for visa ID cards

So you must apply for a visa to go to Spain.

In addition, unlike Macao, Hong Kong's non-permanent identity cards are not only issued to people who have settled in Hong Kong, but to people who have the right of residence in Hong Kong for more than one year. Therefore, Hong Kong's non-permanent residents are not as good as Macao's non-permanent residents, and Macao travel cards applied by Macao's non-permanent residents can be exempted from more than a dozen countries, including Malaysia, but Hong Kong can't.