construction

Sorry, unfortunately I don't know what you mean exactly Blocks aren't affected by gravity, so when placing them, they should never break or fall down automatically (unless you're using a plugin which causes this behaviour)

A screenshot of the issue would be very helpful

I think you have the grid turned on and now the blocks align with the grid, not with the previous block.

Solution: turn off the grid, turn on the magnet function. Done

Quote from Avanar

I think you have the grid turned on and now the blocks align with the grid, not with the previous block.

Solution: turn off the grid, turn on the magnet function. Done

Then... Turn it off

How to add space between blocks ?

Quote from viktorij51

I reached a depth of 5,000 meters, there's water below, what should I do next, and I collected a lot of sulfur and tungsten

5000 meter is not possible

You can dig deeper down from the caverns. Hell is waiting.

Quote from agiser

How to add space between blocks ?

Set the block with control key and move the block a bit to another direction with arrow keys

Alternatively draw a line with blocks but before you place them you use the + key to add gaps between the blocks

Quote from viktorij51

I'm sorry for my outburst, but when players you've been playing with for many years leave, you can't always control your helplessness.

I think many players had issues to switch from Java to unity. Me as well of course. I still don't like everything but especially the building system is by far superior to Java. But also more complex to learn.

Many like the grid but i think it's easier to start with grid off and use only the magnet function.

Watch some videos as well. Or ask here