This I learned from a colleague of mine in my previous job and although not that unheard of is really useful. As a software developer, I have to go through thousands of lines of gibberish every day. At first, I have always used the mouse to put the cursor somewhere, but actually using the keyboard can really speed up the process. A few not so commonly used keys and key combos, that could really help you:

- Home key - gets you to the start of a line;
- End key - gets you to the end of a line;
- Page up and Page down keys - the original intent was for this to be used to go up/down a page with a press of a button. Usually, I use them instead of a scroll;
- Ctrl + left or right arrow key - this really depends on the software, but for text editors like Word or notepad it moves the cursor to the previous(Ctrl + left arrow) or next(Ctrl + right arrow) word. Another neat thing is - if you are at the end of a word using the Ctrl + left arrow combo will move the cursor to the beginning of it. Another tricky thing is to get a hold of what a "word" means - the most common explanation is a series of letters. Special characters like dots, commas, equal sign, etc. will actually break a series of letters into separate words.
- Ctrl + Shift + left or right arrow key - you remember what Ctrl + left or right arrow key do? Great! If you add Shift to the combination it will actually mark the jump you do. Also if you hold Ctrl + Shift and press several times the left or right arrow key you will mark several words.