There are some fairly simple steps that get overcomplicated due to companies selling products.
1) Figure out what you want to grow
2) Look up what kind of soil pH and what nutrients those plants need
3) Test your soil for pH and those nutrients, where possible
4) Amend the soil with fertilizer to correct measured imbalances
A lot of it is trial and error, also. Take note of what you do and the outcomes and keep doing what works. There are so many local variables generalized advice can never hope to cover them all.
1) Figure out what you want to grow
2) Look up what kind of soil pH and what nutrients those plants need
3) Test your soil for pH and those nutrients, where possible
4) Amend the soil with fertilizer to correct measured imbalances
A lot of it is trial and error, also. Take note of what you do and the outcomes and keep doing what works. There are so many local variables generalized advice can never hope to cover them all.