0
1
00:00:00,450 --> 00:00:06,930
So, way, way back at the beginning of the course, we introduced you to Git and GitHub as a part of the
1

2
00:00:07,140 --> 00:00:15,200
I Am Poor Challenge. And that was just to show you how Git works and how you can use GitHub, or our repositories
2

3
00:00:15,210 --> 00:00:21,300
are hosted on GItHub in order to download the skeleton projects and to follow along with the tutorials.
3

4
00:00:21,330 --> 00:00:28,260
Now, in this module, I want to introduce you formally to how Git works and how you can use it to achieve
4

5
00:00:28,350 --> 00:00:29,870
very powerful end.
5

6
00:00:29,940 --> 00:00:35,940
And I'm going to be talking about and showing you how you can use Git both inside Xcode and on the
6

7
00:00:35,940 --> 00:00:43,620
command line to do things, such as version control, well, how to clone repositories, how to fork, make pull
7

8
00:00:43,620 --> 00:00:48,490
requests, and merge repositories, and a whole bunch of really, really exciting things.
8

9
00:00:48,510 --> 00:00:53,990
So, once you're ready, let's get started, and let's start learning about Git.
9

10
00:00:54,090 --> 00:00:57,350
So let's talk about version control in its simplest form.
10

11
00:00:57,480 --> 00:01:01,530
Let's say that I create a new code file and I write a few lines in it.
11

12
00:01:01,530 --> 00:01:05,010
Now, I decide to put it under version control using Git.
12

13
00:01:05,070 --> 00:01:09,060
And let's say that I call this save point as number one.
13

14
00:01:09,060 --> 00:01:12,210
Now, this is my first version.
14

15
00:01:12,240 --> 00:01:14,000
So later on, as I progress,
15

16
00:01:14,010 --> 00:01:21,300
I write maybe a few more lines of code. And at this point, I decide to make another save point, and I call
16

17
00:01:21,300 --> 00:01:23,330
this my second version.
17

18
00:01:23,680 --> 00:01:31,230
So, further down the line, I accidentally screw up my entire code file and it's irreparable, and I get
18

19
00:01:31,230 --> 00:01:38,670
to the point where I would rather burn my entire code file, rather than having to try and fix it.
19

20
00:01:38,700 --> 00:01:44,490
You do get into these situations because very often your code is interlinked and each class depends
20

21
00:01:44,490 --> 00:01:50,910
on another and sometimes you can screw up in a way where, you know, all hope is lost, and I simply just
21

22
00:01:50,910 --> 00:01:54,590
want to roll back to the last save point.
22

23
00:01:54,660 --> 00:01:56,930
I can do that using Git.
23

24
00:01:57,090 --> 00:01:59,110
I can do that using other tools as well.
24

25
00:01:59,160 --> 00:02:02,910
But the most popular tool and the one that we're going to be talking about is Git.
25

26
00:02:03,030 --> 00:02:08,970
So you can either compare your current code file, so the current mess that you've made against a previous
26

27
00:02:08,970 --> 00:02:11,640
version, so at any of the save points before.
27

28
00:02:11,790 --> 00:02:17,640
Alternatively, you can simply just roll back to a previous version, and it doesn't have to be the one
28

29
00:02:17,640 --> 00:02:19,580
that was immediately previous.
29

30
00:02:19,590 --> 00:02:25,530
You can go as far back or as far forward as you like as long as you know which version you want.
30

31
00:02:25,530 --> 00:02:31,610
So in the next lesson, I'm going to show you version control using Git locally on your computer.
31

32
00:02:31,620 --> 00:02:34,190
We're going to use the command line to do this.
32

33
00:02:34,350 --> 00:02:35,190
So I'll see you there.