In most provincial parks and conservation areas, maps are available or are posted at the beginning of a trail. Each intersection will be signed. It is simply a question of knowing the name of the trail and your destination.
Hiking trails managed by trail clubs are usually "blazed". Although individual variations do exist, the usual symbol is a white rectangle, 15 cm high and 5 cm wide, painted on trees or fence posts beside the trail. Usually as you hike the trail, the blazes face you, and if the path ahead is not obvious, another blaze is visible from the first.
A double blaze (one above the other) indicates a turn. Usually the upper blaze is offset in the new direction of travel; otherwise, look for the next single blaze to either the left or the right.
If by chance you lose the footpath, simply return the way you came to find the previous blaze or sign. From here you should be able to relocate the trail and your route.