Good intro books to investment banking and financial modelling?

Regarding Investment Banking I would start with a corporate finance textbok like the one from Vernimmen & Quiry or Berk & DeMarzo. For M&A / investment banking go with the textbook from Rosenbaum.
With regards to financial modelling, Beninga & Damodaran can be useful references (both textbooks and spreadsheets found on their websites). Then you’ve got the financial modelling training like Break Into Wall Street / Wall Street Prep / Wall Street Training (i like BIWS for the sector packages). I think Macabacus is a very useful reference (both add-in and the learning resources). There are also free things you can find in blogs and Youtube channels if you have got time (which I personnally don’t) of some M&A analysts or ex-analysts who like to show off their skills.
That is all I can think of.
Regarding Excel you can find loads of resources, training, certifications, etc. I could not advise which ones to pick.

Dummies book are really good for investment banking

Might sound stupid, but the Dummies book on investment banking is actually quite good. 

Financial management is very hard thing as everything needs a lot of planning and analysis. These suggestions for investment banking and financial modeling learning resources would be very helpful. I am reading many blogs these days to learn basics such as what is equity, capital investments and forex etc.