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Yes, it's best to use a carbide-tipped masonry bit when drilling into concrete. These bits are harder and more durable than standard bits, so they're designed for drilling into tough surfaces like concrete. A different bit is likely to break and pose a safety hazard so you'll definitely want to stick with one that's specially designed for concrete. 

The method used to repair cracks in your concrete driveway will depend on the extent of the damage, but the most common method for small cracks is to use a driveway resurfacing compound. This solution is either cementitious or made of polyurethane, and it will seal the crack and make your driveway appear undamaged. 

For more severe cracks, you will likely need to hire a professional driveway repair service. They can use mudjacking, epoxy injections, partial driveway replacements, or a combination of these to fix more serious cracks in your concrete driveway and to prevent recurring issues.

Thicker concrete is less likely to crack due to extreme weather changes. At a minimum, concrete slabs should be at least 4 inches, but if you’re worried about the concrete cracking under the weight of heavy machinery or from the freeze-thaw patterns of your climate, you should use even thicker concrete. A professional concrete company near you will be able to advise on the best thickness for your climate and use case.

Yes, it's typically best to set aluminum fence posts in concrete. You can technically use a mix of gravel and soil instead, but concrete is more stable and secure. Concrete also lasts longer and does a much better job of withstanding the outdoor elements than a gravel or soil mix.