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I have a question about the leaves of my bonsai...
In my previous post, some people told me, that I should keep my bonsai outside on the balcony, and that the bonsai can die indoors.
So there passed a few days after I moved it outside and continued to look after its leaves (they started getting yellow since the bonsai was delivered to me) and the situation didn't change.
I still notice new yellow leaves, some with brown tips, and some are greyed out.
For the last 10 days, I watered it a few times (about 4 times) and on one of them, I watered with fertilizer and sprayed leaves with another liquid fertilizer.
The things I continue to notice is that leaves still get yellow/brown/greyed out color and fall off.
I cannot understand what's going on with my bonsai.... the first bonsai in my life that I was dreaming of for a long time
The weather is not hot, nor too cold. There is rain and wind last two days, but, as I was said, I have to keep it outside always, even when the weather is not perfect, and I do it.
I would like to know, how to check my bonsai for some illness or fungus... ( I really hope that is not my case), but I don't understand, why leaves get yellow...

P.S. May that happen also because of the moss and overwatering? May be I water it in a wrong way and there is a lot of humidity? I just don't know... I suggest only...

I appreciate your help and time! If someone can help me to understand the reason for this problem, I would be so happy and will thank you a lot!

There is nothing wrong with this plant. Leaves do die, and as it has been moved from one environment to another it is not surprising that one or two leaves drop off. Water when it is almost dry and add fertiliser once or twice per month.

Thank you for your reply. I am afraid because there are not a few yellow and dried leaves. These, shown in the photos, are a part before I removed the other leaves. It is spring now and I wonder what I do wrong. Maybe I will check the roots later. I bought some fungicide and neem oil in case my bonsai is ill with something.
I attached the same photos with a closer look and the older photos

Thank you

If your tree was indoors all winter it has had no chance to shed its old leafs. Now it is outside it will need to shed old leafs in order to grow new ones. Tree looks healthy to me..