How to Screw Into Wood With a Screwdriver
You can drive a screw with or without drilling a pilot hole first. It depends a lot on the type of screw you use and the project you are building. There is nothing wrong with drilling a pilot hole every single time though if you aren't sure.
For shop projects and larger construction projects made from 2x4s, I don't bother drilling pilot holes. You can just drive the screws right into the lumber. It's fast and efficient. You'll have even better results with self-tapping screws.
However, for finer woodworking projects, you risk splitting the wood without first drilling holes, especially near the end of a board.
Drilling a pilot hole allows the threads of the screws to cut into the walls of the hole rather than forcing the wood fibers apart. This creates a stronger connection. Plus, a pilot hole will help the screw to drive in straight.
To drill a pilot hole, select a drill bit that's the same diameter or slightly less than the shank of the screw you are going to use. Use your drill to bore into the wood about as deep as the length of your screw. Press the side of the drill bit against your finger to keep it from wandering and slowly squeeze the trigger to get it started. You don't need to press a lot of weight into the drill, just let the bit do its job. Be careful not to blast through the other side! Keep the bit spinning as you back it out.
If you want the head of the screw to be flush with the face of the wood, use a flathead screw…one with a flat top and beveled sides on the head.
Use a countersink bit or a countersink to add a beveled recess in the surface of the wood that the head of the screw will fit into. This will give your project a professional appearance.
I like to use an impact driver to drive screws in place. A drill will also work, or, if you like twisting stuff by hand, you can use a regular old screwdriver. Set the point of the screw into the hole, holding it as perpendicular as you can with your fingertips and slowly pull the trigger to twist it in. If you have a tiny screw or big fingers, you can use needlenose pliers to hold the screw while you get it started. The biggest mistake you can make that causes the driver to slip out of the head is not keeping it aligned with the screw. Make sure you don't tip the driver one. Just twist the screw in and stop when it's is fully seated.
How to Screw Into Wood With a Screwdriver
Source: https://woodworkingformeremortals.com/how-to-drive-a-screw-and-not-split-the-wood/