New to WordPress – Some Question to Ask

Hallo

I always tended to use HTML + CSS to build my own sites whenever I wanted and kind of avoided all other CMS’s like WordPress!! Not sure why but guess I was a bit afraid it ??

Anyway … I use WordPress 3.4.2 and installed a theme called BroadWay
It looks allright to be honest, however I am finding WordPress a bit “not easy” to start with … took me a bit of time to differ from Pages and Menu lol well yep!!

Another thing is the BLOG template that makes me wonder what that is!?
It lets me choose from – Default Template / Blog Template / Contact /

Let’s say I got a MENU saying – Science
now, when setting Science to “BLOG TEMPLATE” then, that page displays the blog of ALL THE REST of what has been posted.

I mean, can I not control what stuff to be in that blog, eg. only news related to science or even to make it so it shows news from 2 or 3 categories.

Not sure how that can be done!?

Other thing that I do not know how to .. is
when making a menu consisting of submenus, exmaple

Science
– Technology
– Electronics

I finally figured it out how to make submenus under Appearance – Menu but not knowing how to delete any HTTP under the SCIENCE button, but the rest of submenu to have links .

Surely I got lots of other questions but hope to get them sorted out first ?? many thanks indeed