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1.12.2 is no longer supported Please update to a modern version of minecraft to receive support

This statement is a bit incorrect. The methods still exist, they just use a different mapping set (MCP) than what forge ships with the mdk by default (mojmap). You can use forge-bot on the Forge Discord or Linkie on the Linkie Discord to translate from them. I would probably use a chunk capability instead and tick logic on loaded chunks since you'd have to check every block if it's loaded other than checking the loaded chunks. You could also use a world capability to store the chunks that have an active capability for more efficient usage.

use RenderTypeLookup#setRenderLayer in your FMLClientSetupEvent

First of all, this is only possible on servers on which your mod is running and yes you have to send a packet, take a look at the forge doc (networking) if you've read the doc here is a practical example

you can use events to modify blocks and tools - PlayerEvent#HarvestCheck -> harvestLevel - PlayerEvent#BreakSpeed -> breakSpeed - LivingDamageEvent -> damage of tools - LivingEntityUseItemEvent -> durablity read the description of the events for more information about the function of the events and what they do what kind of values do you mean exactly can you give an example of that what you want to change?