In the morning (about 7-8am), feed your sourdough starter.
Once the sourdough starter is bubbly and active, around 1-2pm, begin making the sourdough bread by combining the sourdough starter, lukewarm water, and salt in a large bowl. Mix just to break up the sourdough starter.
Add the flour and mix with your hands until all the flour has been absorped, and you have a sticky dough.
Cover with Saran Wrap or a damp kitchen towel for 30 minutes.
After 30 minutes, complete your first "Lift & Fold" process. To do this, imagine the bowl divided into 4 corner. Lifting from the bottom of each corner, gently stretch as high up as possible without tearing the down and fold into the center. Rotate the bowl and repeat with the next corner.
Cover and rest 30 minutes.
Repeat the "lift & fold" process followed by another 30 minutes of resting for a total of 4 times, so for 2 hours total.
Afterwards, cover it to bulk ferment until you put it away in the fridge.
(Review video for visual instruction.) Around 9-10pm, you'll want to gently transfer the dough to a clean surface. Working form underneath the dough, gently stretch out the dough to a large rectangle without breaking it.
Fold the dough like an envelope into thirds, then roll up into a ball. Tighten the dough by scooping it from the bottom towards you.
Place seam-side up in a floured bread basket.
Store in the fridge overnight.