My sapling sometimes get too much sunlight and sometimes too little sunlight, what can I do?

[ElectroMaster88]

I am trying to grow a common bean from a seed. I did managed to get a sapling which has 2 leaves. I noticed that his leaves were bend over, and I read it can be caused by too little water or too little sunlight, since the soil was moisture, I thought it had too little sunlight so I put it outside. Like a hour after that, I saw that the leaves are now curved upwards and I read this is caused by too much sunlight/heat, so I put it in an area with a little sunlight, and it's leaves were normal again, and then they bent over again.
I can't just move the pot every hour, what can I do to make sure it has always the right amount of sunlight?

 

[Sheal]

Welcome ElectroMaster88.

You say a common bean but we need to know what type of bean it is.