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Yes, you can screw directly into concrete, but only if you use screws specifically made for masonry or concrete. They're often labeled as masonry screws and made of steel and a special thread that provides a strong grip. However, even when using these screws, drilling a pilot hole first will make it much easier. 

Most concrete patios can benefit from resealing every 2 to 5 years, though the exact timing depends on the type of sealer used, how much wear and tear the surface gets, and how exposed it is to the elements. Acrylic sealers tend to wear down faster and may require yearly applications, while more durable options like epoxy or polyurethane can offer longer-lasting protection.

For most homeowners, wood and wood screws are the best materials to make concrete forms because they’re affordable, readily available, and easy to work with. Steel is a better concrete form material because you can use it thousands of times for repeated work, but this is most useful in commercial applications where one job is necessary many times over.

Yes, you can pour a foundation slab without footings, in which case it’s often called a floating slab. Floating slabs don’t have separate footings poured beforehand for support, which means they’re better suited for smaller structures. Monolithic concrete slabs are another option for a slab foundation without standalone footings, although the vertical edges of the single-pour slab do act as footings.