Fail proof gardening ideas.

I am a terrible gardener but I love flowers and plants. I have tried to grow pots plants but only a ‘spider plant’ and crythanthamum has ever survived. I would love to have a garden and home full of beautiful plants and bright flowers. I would try hard to commit to watering them but thats about my limit. What plants would survive chance waterings and occassional accidental neglect or over watering?

I was thinking of buying one of those raised beds maybe trying some vegtable growing or even just planting some gorgeous flowers that will grow and tend to themselves as they do in nature. Any ideas?