Enchant creature or planeswalker When Hold for Questioning enters, tap enchanted permanent and investigate. Enchanted permanent doesn't untap during its controller's untap step and its activated abilities can't be activated.
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Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keywords are activated abilities and will have colons in their reminder text.
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Loyalty abilities are a type of activated ability, so Hold for Questioning will prevent an enchanted planeswalker's loyalty abilities being activated.
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Static and triggered abilities are unaffected by Hold for Questioning.
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The permanent can be untapped by other spells and abilities.
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You can enchant a permanent that is already tapped with Hold for Questioning. If you do, it doesn't become tapped again, but you will still investigate.