I watched guides but in there was information only about ore and tree generations. 
What should I write in ModConfiguredFeatures and ModPlacedFeatures to make it work?

What do you mean about bushes generation? You can always look at vanilla files to see how they works, one thing that comes to my mind when talking about bushes is regarding the jungle patches of leaves that you can find in jungle biomes. You can look at the files for these and copy/edit them to suit your needs

I mean random spawning of bushes in the world

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Edited April 10, 20232 yr by Rellag

Just repeating your question doesn't make it anymore answerable.

Instead of watching tutorials (many of which are wrong or out-dated) and blindly copying code, try to learn how things actually work.

 

Also, this is a support forum. We help people that have tried to implement something and have specific problems they don't understand.

We generally don't answer "I don't know what I am doing can you teach me?" type questions.

 

Anyway:

Worldgen is defined by Mojang using datapacks, this wiki has a summary made from Minecraft's release notes: https://minecraft.fandom.com/wiki/Custom_world_generation

 

Or you can see the latest vanilla worldgen here: https://github.com/misode/mcmeta/tree/data/data/minecraft/worldgen

along with a web gui tool for generating them: https://misode.github.io/

and other guides/information, e.g. https://misode.github.io/guides/

 

But unless you want to create your own dimension or world preset, you will need to use forge's biome modification mechanisms to insert any new features you create into vanilla biomes:

https://forge.gemwire.uk/wiki/Biome_Modifiers

 

Edited April 10, 20232 yr by warjort