My favourite gardening lesson is also my favourite life lesson.
There are no mistakes in gardening, only learning experiences.
It is all a matter of perspective, really, as is most of life. Glass half empty or glass half full?
Sure there are posts and books about common newbie gardener mistakes, like not giving plants enough space, under or over fertilizing, or planting in the wrong location. I have read many of them, and when I started container gardening many years ago, and then gardening in my raised beds 5 years ago I did what I do when I start anything new: I read up on how to do it.
But gardening, like life, cannot always be anticipated perfectly, and sometimes things do not go as planned. Of course it feels like a mistake when the garden does not turn out the way you intended it.
But there are no mistakes, only learning experiences and happy surprises.
An example is my backyard garden so far this season. I was very excited to plant asparagus for the first time this year because I love perennial plants that are plant once and go. I wouldn't be able to harvest any spears this year to allow the plants to establish themselves firmly in the soil, but oh the wait would be worth it for delicious, fresh homegrown spring asparagus. I read the information packet that came with the roots I ordered from a local seed company, did a quick search on the internet to read a little more and then I planted them quickly before heading off on a family vacation.