There are so many types of screwdrivers that you could go crazy trying to pick which one is correct!!!
If you are just starting out, only on need to start with one: a combination screwdriver that has a #1 & #2 Philips tips, 3/16” & ¼” flat, and 2 combinations of hex drive. I have several of them, and they get the most use of all of my screw drivers. Depending on options, these are referred to as 4-in-1, 6-in-1, 10-in-1, 11-in-1, etc.
Philips tip: this is the cross and is quite common on a variety of screws. Originally invented to cam out when the correct torque was reached, they can be frustrating when trying to remove a screw that is too tight. Having the correct size of tip is important, and that it is not damaged.
These come in a variety of sizes, #1 (small), #2 (medium) and #3 (large). #2 Philips is the most common.
The flat or straight end is sized according to the width of the flat. The larger the width, the thicker it will be. Most common are 3/16” and ¼”.
Screwdrivers are also sized according to the length of the shank, which dictates how far you can reach with it. Stubby ones have a very short length. Regular ones vary between 4 and 6 inches. Then there are extended reach that may be 8” or more inches long.
There are sets of screwdrivers that have 100 varieties, unless you are a professional, you don’t need this! A small set of 4 to 7 screwdrivers will cover the majority of uses.