Mix the masa flour & salt in a small bowl and add 1/2 cup of hot water. Stir together until a dough forms. Add more water if necessary to make a dough that is not sticky but is not too crumbly.
Cover with a tea towel and let the dough rest for 2 hours.
Split the dough into 8 pieces and roll into balls.
Take a dough ball and place it between 2 pieces of baking paper. Using a flat plate or a cake tin (anything with a flat bottom) press down on the ball to flatten it, or use a tortilla press if you have one.
Using a rolling pin, finish rolling out the tortilla until it is super thin and about 6 inches across.
Repeat with all dough balls.
Heat a frying pan over a medium-high heat.
Cook tortillas for 1 minute on each side - they will start to curl up around the edges on the first side and will slightly char and puff up on the second side.
Repeat with remaining tortillas.
Preheat the oven to 200 degrees C.
Lightly brush both sides of the tortillas with oil (no need to let them cool down) and sprinkle with salt. Cut into triangles.
Bake for 5 minutes, remove from oven and flip over before baking for another 5 minutes, keeping an eye on them to make sure they don't burn.