Plants are actually kind of easy. If you want to try again:

• Choose the right plants. Yes, some plants are hard to keep and need specific environments. Avoid those, other plants are able to grow on a parking lot in the summer
• Some plants need direct sunlight, others like the shade. Some plants need a lot of water, others not. This is written on this little cardboard thingy when you buy them

Yeah, and that’s it. Buy plants that don’t need much maintenance and you’re fine. Maybe set a reminder to water them.