A lot of people generally donβt carry lighters or matches on them anymore so starting a fire will be hard, unless if you live in an area with easily accessible flint rocks.
Generally if you find some dry grass, make a birds nest, rip some bark off a try to protect it, and begin moving some sticks back and rub them against the bark, you will create heat but it will take some time to get a spark going. About 30-45 minutes and it will hurt.
From there slowly build the fire being careful not smother it. And try to keep it alive 24/7.