Learn and practice making fires using all kinds of different materials, such as matches, lighters, with both dry wood and wet wood/less desirable material, a flint, with glasses…
Perhaps the most reliable method when there are not fire sources such as a lighter or flint available is using a Bow Drill to create Fire by Friction. To use a bow drill in a true survival situation, you need to know crude stone working, cordage making, and have knowledge of local flora for tinder.