Sadly I don't know much about cars yet I have owned them for decades. If something goes wrong with my car it would be easy for a mechanic to sell me something that I don't need. They could sell me a gallon of headlight fluid and I would buy it. I almost always consult family members who understand cars before I agree to any repairs.
Many real estate professionals rely on websites and technology these days, as much as they rely on their cars, and most know as little about how it all works as I know about my car.
I don't think anyone has to be an auto mechanic to drive a car, and I don't think a Realtor needs to be a Web developer to use a website or blog. In fact, I think learning Web design or coding is a ridiculous waste of time for the average busines