Taxes. oh taxes..

I don’t know how anything works. What do big businesses get taxed and what do middle class americans get taxed? Why aren’t big businesses and industries paying all of the tax leaving lower class people to pay little to no taxes? Would that be a good thing? I could see it as a burden to big business not allowing them to grow and make better/more efficient products or services. But then this would be allowing more people to have money to put into the economy. What is the general opinion on this?