So i been making my new map and i pressed a button and all the objects vanished but the work when i test it... Anyway to be able to see them on editor??

Shift+W

The button you pressed was W; to hide all objects. Shift+W unhides all objects.

Heres a list of Hot keys I can think up. (I wrote this a year or two ago.) So if you have any questions, just ask.

Use ( Ctrl + G ) to align every thing objects and Brushes
Use ( O ) to orient all objects and brushes
Use ( Ctrl + Z ) the UNDO stuff (suppose you made a mistake, coincidentally deleting something) ( Ctrl + Z ) to the rescue
Use ( Ctrl + Y ) to REDO stuff ( suppose you Hit (Ctrl + Z) to many times and UNDID to many things) (Ctrl + Y) to the rescue
Use ( Q ) to LOCK selected Brushes (or grey them out ) Make them unelectable in Texture, Brush, Vertex, Group Mode
Use ( Shift + Q ) to UNLOCK all brushes
Use ( W ) to hide all objects
Use ( Shift + W ) Unhide all objects
Use ( H ) to Hide selected Objects and Brushes
Use ( H + Shift ) to unhide selected brushes and objects.
Use Space bar to quickly rebuild Geometry in all Editor modes
Use ( Ctrl + C ) to COPY brushes, objects and UV Unwraps
Use ( Ctrl + V ) to PASTE COPIED brushes, objects and UV Unwraps
(when i say Copy UV unwrap i mean you can select 1 face and hit ( Ctrl + C )
then select as many faces as you want and hit ( Ctrl + V )to Paste those UV
unwraps) *this does not mean you will be copying the Textures*
In BRUSH MODE to make brushes Transparent look in the lower left
side of the editor and under Brush propertys (with the brush you want to modify selected)
click (or check) the Detail Box. Then apply a texture with transparency enabled, and Rebuild
Geometry,
The Mode called "Vertex" gives you a unlimited power to warp, bend, Stretch, Skew, crack, and break Brushes.
When you Enter the Vertex mode all the CORNERS of all the brushes in your level will have Little blue things on them These are called Nodes. you Can Select these Nodes and you can move them around any way you want.