[PATCH 2/2] gitfaq: append the 'Common Issues' section

[Shourya Shukla <shouryashukla.oo@gmail.com>]

Add more issues and their respective solutions in the 'Common Issues'
section of gitfaq.

Signed-off-by: Shourya Shukla <shouryashukla.oo@gmail.com>
---
 Documentation/gitfaq.txt | 72 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)

diff --git a/Documentation/gitfaq.txt b/Documentation/gitfaq.txt
index 3ca16b1092..ccc14774ba 100644
--- a/Documentation/gitfaq.txt
+++ b/Documentation/gitfaq.txt
@@ -223,6 +223,78 @@ a file checked into the repository which is a template or set of defaults which
 can then be copied alongside and modified as appropriate. This second, modified
 file is usually ignored to prevent accidentally committing it.
 
+[[rebasing-and-merging]]
+How do I know when to merge or rebase?::
+	Rebasing and merging two entirely different concepts with different utiilites.
+	In Git terms, rebasing means to place changes made in one branch over another branch
+	(called base, hence the term rebase). The commit history of the branch wanting to rebase
+	get placed over the branch on the receiving end and it appears as if those changes took
+	place in the receiving branch itself. Merging, as the name suggests, merges the latest
+	commit of one branch onto the recent branch, making this combination appear as one separate
+	commit.
++
+As an additional tip, one can use interactive rebasing, `git rebase -i`, to perform rebasing
+using a text editor GUI (the value of $GIT_EDITOR). Interactive rebase is an excellent utility
+to perform various functions such as editing commit messages, dropping/squashing commits, editing
+commits, etc. in one package.
+
+[[files-in-.gitignore-are-tracked]]
+I asked Git to ignore various files, yet they show up as changes in my staging area::
+	One uses `.gitignore` to ignore files from getting tracked in the working tree. This ignores
+	the aforementioned files for the whole lifetime of the project unless they area removed from
+	the `.gitignore`. But, `.gitignore` will only ignore the files which were not a part of the
+	repository when they were mentioned in the `.gitignore`. Hence, addition of a file to `.gitignore`
+	after it was added to the working tree will have no effect and Git will keep tracking them.
+	To prevent this from happening, one has to use `git rm --cached <file>` to remove the file
+	from the staging area(i.e. the cache) and not from the repository. 
+
+[[changing-remote-of-the-repository]]
+I want to change the remote of my repository. How do I do that?::
+	A remote is an identifier for a location to which Git pushes your changes as well as fetches
+	any new changes(if any). There might be different circumstances in which one might need to change
+	the remote:
+		1. One might want to update the url of their remote; in that case, the command to use is,
+		   `git remote set-url <name> <newurl>`.
+
+		2. One might want to have two different remotes for fetching and pushing; this generally
+		   happens in case of triangular workflows. In this case, it is advisable to create a
+		   separate remote just for fetching/pushing. But, another way can be to change the push
+		   url using the `--push` option in the `git set-url` command.
+
+[[fetching-and-pulling]]
+How do I know if I want to do a fetch or a pull?::
+	A fetch brings in the latest changes made upstream(i.e. the remote repository we are working on).
+	This allows us to inspect the changes made upstream and integrate all those changes(iff we want to)
+	or only cherry pick certain changes. Fetching does not have any immediate effects on the local
+	repository.
+
+	A pull is a wrapper for a fetch and merge. This means that doing a `git pull` will not only fetch the
+	changes made upstream but integrate them as well with our local repository. The merge may go smoothly
+	or have merge conflicts depending on the case. A pull does not allow you to review any changes made
+	upstream but rather merge those changes on their own.
++
+This is the reason why it is sometimes advised to fetch the changes first and then merge them accordingly
+because not every change might be of utility to the user.
+
+[[checking-out]]
+What is checking out a commit/branch? How do I perform one?::
+	In Git terminology, checking out means updating the current working tree with a another commit or
+	even a separate tree(which would translate to a branch). This means that if I were to:
+		1. Go to another commit, to lets say modify stuff in that commit; I would be "checking out"
+		   to that commit and enter a "detached HEAD" state, meaning, that the "pointer" called HEAD
+		   which tells me where I am right now in my working tree is not where it generally should be,
+		   i.e., the latest commit(or the tip of the branch). I can now work upon the checked out
+		   commit and make any changes or just inspect the files at that state.
+
+		2. Go to another branch or create another branch; I would be "checking out" to another tree
+		   in my local repository. One might expect to enter a detached HEAD here as well but in fact
+		   does not. This is because HEAD would point to the tip of the checked out branch, something
+		   which is not a characteristic of a detached HEAD.
++
+To checkout to a commit, one can either pass the SHA1 of the commit to be checked out or a reference to it wrt
+the HEAD. To checkout to another already existing branch, one should use `git checkout <branch-name>`.
+Also, one can create a new branch as well as checkout to it at the same time using `git checkout -b <new-branch-name>`.
+
 Hooks
 -----
 
-- 
2.20.1