How does route table handle inbound traffic

Hi everyone! I’m just curious how does the route table handle incoming traffic and send them to the Network ACL since I saw in the network diagram that all traffic have to go through the route table first then being forwarded to the Network ACL. My guess is since each route table is associated with a subnet or subnets, whenever it receives traffic, the route table will just forward it to the NACL that is associated with destination subnet? So, the route table is allowing any traffic to flow in by default? then NACL does the filtering. Correct me if I’m wrong. Thank you!!