You don't want anyone to find that something is seriously wrong when you're selling your house. A home inspection report will detail the major systems in the house, including heating and central air conditioning. It also outlines the interior plumbing and electrical systems. It will also outline any visible insulation, walls, and ceilings, as well as the foundation and other structural elements of the house.
Depending on the inspector, they may also identify smaller issues that you aren't aware of. While minor problems can be addressed quickly but more serious issues could turn out to be a deal-breaker. A home inspector can help you identify these things before you make an offer. It is recommended to hire an expert home inspector to assist you decide if the problem is too severe to let repairs be completed by the seller.
While you don't need to be present for the inspection, it is an ideal idea to be there. You can ask questions regarding the condition and system of the house by being present. You'll also understand what the inspector is looking at and the reason why it's important. After the inspection, you'll be able to understand the written report. It's a good idea for an inspector to have a solid reputation, an excellent level of training, and extensive experience.