Activate the yeast: In a large mixing bowl, combine the warm water, sugar, and active dry yeast, stir gently and let it sit for about 5-10 minutes, or until it becomes frothy.
Prepare the dough: Add the flour and 2 teaspoons of sea salt to the yeast mixture, mix until a shaggy dough forms, gradually add 1/4 cup of olive oil and continue mixing until the dough comes together.
Knead the dough: Turn the dough onto a floured surface and knead for about 5-7 minutes, or until the dough is smooth and elastic.
First rise: Place the dough in a lightly oiled bowl, cover with a clean kitchen towel, and let it rise in a warm place for about 1 hour, or until doubled in size.
Shape the focaccia: Preheat your oven to 400°F (200°C), line a baking sheet with parchment paper and drizzle with olive oil, turn the risen dough onto the prepared baking sheet and gently stretch it to fit the pan.
Second rise: Cover the dough with a kitchen towel and let it rise for another 20-30 minutes.
Prepare the topping: Use your fingers to create dimples all over the surface of the dough, drizzle generously with olive oil, then sprinkle with dried rosemary, thyme, and coarse sea salt.
Bake the focaccia: Bake in the preheated oven for 20-25 minutes, or until the focaccia is golden brown and the edges are crispy.
Cool and serve: Remove from the oven and let it cool on a cooling rack, serve warm or at room temperature.