Plant Shopping

Took a trip to the garden centre today. It was lovely looking around, deciding what might go where. Looking like I knew what I was doing...but didn't.
I'm ok at chopping and weeding, but I'm rubbish at knowing anything about plants, where to put them or how to treat them. I really need very easy low maintenance things.
I gave myself a days work. Planted some tubs and a wall cavity. I also bought some seeds to scatter in the back. The old soil I took out of the tubs has been used to fill cracks in the lawn. I think I'm getting there.