A little help here...

How do you select more than one object in hammer, I mean, if you can?
Oh wait, never mind

If you google “hammer hl2 beginner tutorials” you’ll get a shitload of links to various tuts.

Ctrl+click? or enable auto select and drag-select

Do you even know anything yourself about hammer? I see all your posts in heling just “try google bla bla bla