Hi as I am new to gardening I do know that testing your soil is important in order to find the right balance of nutrients depending on what you are growing. What tests do I have to do? I've heard of ph tests but how do you find what types of nutrients you need to add? I would like to keep this in a budget and not send my soil to labs etc. Any specific products mentioned would be helpful to get a better understanding in what to look for when buying.