Some questions

[gastrop0d]

I haven't been able to figure out how to have cliff types transition, like this:



I swear I've seen it in a bunch of maps people have posted here. How do you do it???

Second question. I try to put trees/some rocks on the background level, but the editor just beeps at me and won't do it. How do you get this:

[KDraconis]

I haven't been able to figure out how to have cliff types transition, like this:

Tools > Brush > Allow Cliff Merging.
The hotkey for this is [Shift + I].

I swear I've seen it in a bunch of maps people have posted here. How do you do it???

View > View Entire Map.
This is one way to get a full view of your map; just screenshot and upload the picture to the forums.
Or, if you mean your ACTUAL map file, then look in MyDocuments\StarCraftIIBeta\Maps. Just upload your map to a filesharing site and paste the link here.

Second question. I try to put trees/some rocks on the background level, but the editor just beeps at me and won't do it. How do you get this:

use [Shift + Left Click]. This allows you to place units/doodads without being restricted by grid, placement, or boundaries.

[gastrop0d]

Thank you! Much appreciated.

[n00bonicPlague]

Cliff merging is da sehkz

[gastrop0d]

Okay, next question: how to you edit the fog effects on the low-level terrain?