Forex and Economy

I’m confused with the way things are when it comes to forex exchange and the effect it has on the country. I was made to believe in the past years that it’s good for a country like us to have an exchange rate equivalent to lesser peso because it means that our currency is getting stronger but I just can’t relate these changes to what’s happening in the prices of basic commodities. When dollars goes down the prices in peso should lower down but as I see it it’s not affecting the usual and normal groceries that we buy on supermarket. I only see the difference when I buy gadgets online. I was thinking if an advanced Forex training would help me understand the effect of forex on our economy. I know it should be a balance of things when it comes to economy, basic commodity price setups and some other things. I should learn some basic data about forex.