A very commonly used tool, the claw hammer is a good tool to have in your toolbox for basic tasks such as hammering nails.
Screwdrivers come in many different types (e.g. Flathead, Phillips) and sizes. It is always good to have a solid set of screwdrivers to ensure you have the right one for every project.
A Tape Measure is always good to have as taking measurements is quite common for most projects and is very necessary for doing a job properly.
Pliers can come in different forms (e.g. Needle Nose , Vise Grip) and can be used for many things such as cutting wire.
A wrench is a very commonly used tool that can come in a few different forms (with “Crescent” Wrenches being one of the most practical all-around options) and is a great tool to have in your toolbox.