The first thing that you have to learn about houseplants is that they don't all like direct sunlight!
Three of the four got sunburn from too much light!
The second thing you need to learn are the terms bright light, some sun and full sun. Not to mention shade loving plants.
I am pretty sure your bottom plant is a dessert Rose. It is a tropical to semi-tropical plant and it likes as much sun as you can provide. The more sun, the better it grows and flowers.
Plant number two is a schefflera of some type. They like bright light. A little morning sun won't hurt them.
The other two are Dracenas I think. They like a bright spot too but without direct sun.
All plants should be in pots or containers with drainage holes. Nothing else will suffice!
Another good point. Plants do NOT need fertilizer as much as you think. Once every three months is more then enough. Fertilizer is NOT a cure. If the lighting is wrong and the watering schedule is bad, fertilizer won't fix or cure anything!
Most plant do not want to be grown wet. Most do not like it too dry either. You water most plants when the top inch or half inch of soil feels dry. And then water it enough so that the water runs out of those drainage holes.
Others will offer advice as well.
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