I've heard a lot about schools learning with Minecraft. Can someone explain how you want to convey tasks here?

What are these tasks? What exactly do the students have to do?

E.g. Merge elements in education edition. Our school potato Pcs are unfortunately too slow

I googled this for you and there are a few examples in an article:

history
In Minecraft, students can playfully visualize historical events and epochs, making it easier to memorize. The story known from the books is thus revived. Entire buildings and cities can be imported or reproduced in Minecraft. How about a visit to the Colosseum together to learn about Roman antiquity? Or should the Berlin Wall be rebuilt? In Minecraft you go on a journey through time with your students that is instructive and promotes creative thinking.

technology
The basics of electrical engineering can be taught using Redstone, the equivalent of electricity in Minecraft. The students take advantage of the redstone ore, build circuits and machines and then operate them with redstone. How about building an alarm system or a power plant, for example?

Java programming
Programming has developed into a core competence on the job market in recent years. Modding can be used to introduce modifications to Minecraft: the students develop their own mineral blocks, ore variants or objects that they can then share with their classmates. For coding, they learn the basics of one of the most widely used programming languages worldwide: Java.

mathematics
Minecraft has many uses in the field of mathematics. For example, how much food is needed to survive a mining adventure? How large is the area that a medieval city can accommodate? Computing is a natural part of the gaming experience at Minecraft. In addition, the students can create new shapes in Minecraft and solve geometric tasks.

You can read more here: https://cloudblogs.microsoft.com/industry-blog/de-de/education/2017/10/04/minecraft-in-der-schule-sinnvoll-nutzen/