traffic allowed by default from higher to lower security zone in firewall

Dear All,

Please clarify my below point.

video says, all traffic allowed by default from higher to lower zone i.e. inside to outside but my query is that do we need to allow return traffic on outside interface ? if yes then understanding will like this, traffic allowed by default from inside to outside but return traffic should be allowed on outside interface in inbound direction. correct?

also pls let me know if all all type of traffic and all ports TCP UDP allowed by default from inside to outside ? absolutely all traffic ???

regards,

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