So, you're working on text in vim, be it README's, code or a novel, it doesn't matter, you'll be working with text objects in any case. You should start learning to use the text objects to your advantage, e.g. instead of moving to the beginning of a sentence and deleting it, you can do that from within the text you're manipulating.
Inside word: iw
Around word: aw
So, what you can do to delete around a word, daw. Consider the following: "Delete around word." if you run daw on the word around, you'll get Delete word.. If in turn you run diw you'll get Delete word., notice the extra space there. Any other actions can be run against these, e.g. change, delete, etc.
Inside sentence: is
Around sentence: as
The same applies for sentences as for words. You can e.g. change a sentence from wherever you are within the sentence. Let's consider the sentence: This sentence I want to keep. This sentence is not too good, and I want to change it to something else. This again I want to keep. Running cis on the word good, vim will delete everything from the start of the sentence and put you in insert mode at the beginning of your new line.
Let's try it out:
This sentence I want to keep. This sentence is not too good, and I want to change it to something else. This again I want to keep.
There are other text object types that work in a similar fasion, and that includes:
Paragraphs: ip and ap
Single quotes: i' and a'
Double quotes: i" and a"
Parenthesis, brackets, braces, back ticks: i( and a(, i[ and a[, i{ and a{, also i<backtick> and a<backtick>.
Tags: it and at (Think about HTML tags)
These might come in handy when you're editing HTML or any other code, since you can easily change something that's inside quotes, delete or replace.
Please read the instructions in the assignment-2.txt file, and try working on undoing, redoing and working on text objects. In the second assignment we're going to use the things we have learnt this far.