If lets say I want to transfer a certain document or files which are of compatible format with the Kindle such as PDF or TXT from my computer, can the Kindle connect to a laptop or a computer through 2.0 USB input?

Lets say I need to take down some important notes, can I type in a document and save it in Kindle like how a laptop does with a notepad application?

I heard that some ebook reader have a built in dictionary. Does the kindle have that or do I have to download my own dictionary and put it in?

I'm worried about the size of Kindle. I thought it was just slightly bigger than a phone and I could just slip it in and out of my pocket whenever I feel like it but it turned out to be bigger than I thought. So my next question is to all the Kindlers out there:

How do you bring your Kindle about as so not to lose it or to be an easy target for snatch thieves?

Also a few doubts to clear my head:
1.) Can you jump pages in Kindle?
2.) Can you bookmark a page in Kindle? If so, only one at a time or several?
3.) Can you read manga's or marvel comics in Kindle?

File sent. Hope you upload the pictures quick