When I get'm on holiday, I watch Youtube, write English essays, and learn English waords ion PC's APP apps.

I watch a movie about Minecraft on Youtube.

But Minecraft is not played by me.

Unnatural, better sentence would be "But I don't play Minecraft/But I'm not the one playing minecraft"

Because I can't play the game well.

Clauses starting with "because" don't work as standalone sentences, should be a part of the previous sentence

When I get'm on holiday, I watch YoutTube, write English essays and learn English waords in PC's APPswith apps on my PC.

(1) The phrase is "on holiday".
(2) Strictly speaking, "YouTube" is the correct capitalisation.

I watch movies about Minecraft on YoutTube.

But Minecraft is not played by meI don't play Minecraft.

Your sentence is grammatically correct, but the use of the passive voice is very odd. It places emphasis on Minecraft, but since this is about you, the emphasis should be on you instead.

Because I can't play the game well.

You can also merge this with the sentence above: "But I don't play Minecraft because I can't play the game well."

When I get'm on holiday, I watch Youtube, write essays in English, esayand learn English waords in PC's APPsapps on my PC.

I also watch movie abouts on Minecraft on Youtube.

But Minecraft is not played by me.I don't play Minecraft.

Because I can't play gameit well.