Building an inverter

Hello everyone!!! actually I'm building an inverter. Be ready to read my question in case something goes wrong. I'm new in this forum but I have a lot to share with all of you.

I have reliable electricity so I have never used an inverter. Some people go into the bushes for camping , fishing or hunting and they simply buy an inverter.
Many modern electrical products rely on the high peak voltage of a sinewave so they do not work properly when powered from a simple and cheap squarewave inverter.

Thank you for your answer.