[ctbeiser]

A few things that should be noted:

"There are only a bunch of fonts that designers use." This really isn't true. There are about a hundred or so that are particularly common that any good designer should be able to recognize on sight, but there's an enormous long tail, many of which are perfectly servicable for specific uses.

"Corrections at this stage will generally be minor" Your interface's visual corrections may be minor, but in terms of usability, information architecture, and so forth, if you haven't incorporated results of real testing by this point, you're in for a real suprise. Especially if you're not versed in design and usability literature, you're likely in for either a lot of frustrated users or a lot of reworking.

I'll also just point out, while I'm at it, that on your screenshots page, your Facebook icon is next to the word "Twitter," and proximity implies association.

[udayaprakash19]

bunch of fonts should more be like "bunch of fonts that they use on a regular basis" and I would like to incorporate your second comment into the slide if it is ok with you. I am making corrections in the app based on usability tests and thanks for pointing out the fb and twitter icons.

[ctbeiser]

I'd say "bunch of fonts that are widely used." Some designers have obscure favorites that they use regularly.

If you're really looking for a good grounding in HCI fundamentals, The Design of Everyday Things, The Humane Interface, and, oddly enough, the OS X Human Interface Guidelines are among the best. For type, try "The Elements of Typographic Style," and for a basic, general overview of some concepts you should understand, "The Universal Principles of Design" is, well, not bad.