On Tuesday, 10 Jan 2017 at 23:49, edgar@openmail.cc wrote:
> Hello,
>
> I am new to org-mode, because it seems impressive, and I think that it 
> will make my life much simpler. Thank you!
>
> For the following, I am attaching example org, pdf and tex files (the 
> last two generated by org-mode > export beamer PDF).
>
> First, why does slide 3/4 contain two main headlines fit into a single 
> slide?

Your org file layout is a little confused.  You have told org that
beamer slides (aka frames) will be level 2 headlines (so level 1
headlines become sections).  Then you, for instance, some content
directly under a level 1 headline which is ignored.  Third level
headlines will become blocks within a frame.

> Second, how do I force a new slide so that the "Figures" block is not 
> cut-off on slide 4/4?

Currently, it is part of the "Structure and Function" slide because your
figures are within a level 3 headline which is converted to a
block.  Put the figures under a second level headline instead.

> Third, how do I get the contents of "Description of the project" (slide 
> 3/4) into a block (like Concepts in slide 4/4).

Blocks are 3rd level headlines so put the contents within a 3rd level
headline.

HTH,
eric

-- 
: Eric S Fraga (0xFFFCF67D), Emacs 26.0.50.1, Org release_9.0.2-104-gf5b7de