I'm an accidental gardener. I found out by accident how easy it was to grow various herbs, strawberries and tomatoes. Earlier this year, I tried a potato kit with excellent results, mange tout, sugar snap peas and dwarf french beans. All of these were in pots as I have a very small house and garden (with two dogs). It is a case of trial and error and always ask for specifics and/or read up if you don't know. Generally, looking at the plants as they grow will let you know if they are happy or not.
Two months ago, I was very lucky to get a landshare plot near me and all seems to be growing OK, bar the onions. I'm giving them a bit longer before I decide to move them as they go through stages of being very happy and swelling to doing nothing and looking sad. I'm sure I'm missing some essential nutrients for them, but after stripping out the grass that had been there for 15+ years and digging over the earth, etc. something that hungry will wax and wane in the soil. My kale and other brassicas are very happy. Only time and mistakes will tell!
Good luck with whatever you try and enjoy every mouthful. It tastes so much better when you have looked after it growing and it has just been picked.
In response to How to become a good gardener? Any advice? Thanks
To replenish the soil of depleted nitogren and enjoy some much needed greens, I would sow some over-wintering spinach seed. In around 6 - 8 weeks you will be picking spinach leaves and it will carry on growing all winter. When other stuff you've planted elsewhere is ready to harvest, you dig it back in and let it replenish the soil for you.