Once you hit the 60-day window until your trip, you can make dining reservations! Not all Disneyland visitors make reservations ahead of time, but it’s a good idea if you have a specific table service restaurant you want to visit. Otherwise, you could be in for a long wait, even when the park isn’t terribly crowded.
There are two kinds of restaurants at the Disneyland Resort: quick service and table service. Quick service means you order at the counter, and take your food to a nearby seating area to eat. Table service is the standard restaurant experience, with wait staff and no self-seating. You can’t make reservations for a quick service restaurant, but you can (and should) for table service.
For my reviews of the Disneyland Resort’s restaurants, check out the links below.