Yes, you can learn the piano by yourself. However, it is best to have a teacher by your side to guide you through the difficult stages of learning the piano. There are techniques such as fluid hand motion and technical issues that you can’t solve by yourself. Imagine if you tried to learn how to fix your sink and you spent hours googling how to do it. You could have just hired a plumber to come fix it and they could have done it in 30 minutes.
I know that this isn’t what people want to hear. It’s not what I would want to hear if I was a beginner, but I don’t want to lie to you. I don’t want to sell you a piano course that doesn’t guarantee that you will learn the piano. I don’t want to sell you a product that might work. I actually want to give you advice that will save you time and money. You can’t do everything yourself. I’ve seen many students fail at learning the piano by themselves. Please don’t listen to all the advertising gibberish online. You need to find a piano teacher that can physically be right next to you and to guide you through this process. Don’t waste your money on anything else. I’ve seen many instances where it doesn’t work.
I hope this helps you and let me know if there are anymore topics that you want me to discuss.