Jan Tschichold
Paul Renner
Bauhaus
Herbert Bayer
etc. pp.

and i am noooot looking forward to this one!

Why not? This is one of the most thrilling periods of design history.
Some more keywords for you: Russian Constructivism, Suprematism, El Lissitzky, László Moholy-Nagy, Alexander Rodchenko, Josef Albers, Alexey Brodovitch, Imre Reiner, Georg Trump, Friedrich H. E. Schneidler, Paul Schuitema, Piet Zwart, Theo van Doesburg, Dada, Kurt Schwitters, Art Deco, Cassandre, Rudolf Koch, Eric Gill, Jakob Erbar …

Now: what James said.

why geometric shapes became the it thing.

But they didn't.
The 1920s was a period of historicist design.

Art Deco is an all the history books, but at the time it was a marginal part of typography, as was Modernism.
If you look at any mass circulation magazine of the era, there may be one ad out of hundreds that has a "modern" or art deco style. The rest are historicist.
The same thing is true of typefaces.
Most of the types designed during the 1920s were historicist.
The seminal sans serif types Gill, Futura, and Kabel were published at the end of the decade, and became established in the 1930s.
But if you want to appeal to your professors, by all means write about modernism in the 1920s, because they are academics who live in a dream world divorced from reality.
Just remember that you will probably end up working in the real world.

Here is a high-tech audio ad from the 1920s.
The headline type is Benton's Cloister Bold, based on the 15th century work of Jenson.
The rest of the type is Goudy's neo-Renaissance design, Old Style.
This, rather than a poster by someone who taught at a small Weimar art school, is what most 1920s typography looked like.

@kldolinger - the internet isn't anywhere near the biggest library in the world. Libraries are full of good books - 99% of the Internet is unsubstantiated crap, full of holes and misleading "facts" and biased articles by people with something to prove, so heavily slanted that you can't trust it.

Art Deco is an interesting movement, but as others said here, it was marginal at the time and is only the focus of so much attention now due to its relevance to modernism and what came from it.

Unfortunately much design education today focuses only on what reverberated later, looking back at it through a lens colored only by things that informed later pop & trendy styles. It's an unfortunate fact that many of the design programs I've had experience with almost totally exclude the much more interesting and philosophically intricate Arts & Crafts influence that was peaking in the mid 1920s in all aspects of design.

Joshua

i'm so freaking lost with what to do with this book about. i'm just about close to giving up and not doing it

For broader context and more on the roots of Art Deco you can probably find in a library Nancy Troy, Modernism and the Decorative Arts in France.