$ cd ~  # ホームディレクトリに移動
$ gem install rails --version="5.0.7.2"
#バージョン指定

$ rbenv rehash

$ rails _5.2.3_ new 新規アプリ名 -d mysql

$ rails db:create

/git管理下に置きたいディレクトリへcdで移動し下記実行/
$git init 
$git add .   /.は全部という意味/
$git status　/ちゃんと移動したか確認/

$git commit -m "initial commit"

# 末尾に次の記述を追加
public/uploads/*

gem "haml-rails", ">= 1.0", '<= 2.0.1'
# 最下部に記載

$ bundle

$ rails haml:erb2haml

Would you like to delete the original .erb files? (This is not recommended unless you are under version control.) (y/n)
#yを入力してエンター

# 省略
（例）
module ChatSpace
  class Application < Rails::Application
    config.generators do |g|
      g.stylesheets false　#←このfalseで作成しないファイルを指定できます
      g.javascripts false
      g.helper false
      g.test_framework false
    end
  end
end

$ rails g controller コントローラ名(例：popcorn)

def index
end

hello haml!(おすきに入力)

root to: 'popcorn#index'
#'コントローラ＃indexのビューへ飛んでね'の意味

@import "scssファイル名";
#importしたいファイル名の頭は_（アンダーバー）始まり。

@import "reset";

/*
    TODO will need to remove settings on HTML since we can't namespace it.
    TODO with the prefix, should I group by selector or property for weight savings?
*/
html{
    color:#000;
    background:#FFF;
}
/*
    TODO remove settings on BODY since we can't namespace it.
*/
/*
    TODO test putting a class on HEAD.
        - Fails on FF.
*/
body,
div,
dl,
dt,
dd,
ul,
ol,
li,
h1,
h2,
h3,
h4,
h5,
h6,
pre,
code,
form,
fieldset,
legend,
input,
textarea,
p,
blockquote,
th,
td {
    margin:0;
    padding:0;
}
table {
    border-collapse:collapse;
    border-spacing:0;
}
fieldset,
img {
    border:0;
}
/*
    TODO think about hanlding inheritence differently, maybe letting IE6 fail a bit...
*/
address,
caption,
cite,
code,
dfn,
em,
strong,
th,
var {
    font-style:normal;
    font-weight:normal;
}

ol,
ul {
    list-style:none;
}

caption,
th {
    text-align:left;
}
h1,
h2,
h3,
h4,
h5,
h6 {
    font-size:100%;
    font-weight:normal;
}
q:before,
q:after {
    content:'';
}
abbr,
acronym {
    border:0;
    font-variant:normal;
}
/* to preserve line-height and selector appearance */
sup {
    vertical-align:text-top;
}
sub {
    vertical-align:text-bottom;
}
input,
textarea,
select {
    font-family:inherit;
    font-size:inherit;
    font-weight:inherit;
    *font-size:100%; /*to enable resizing for IE*/
}
/*because legend doesn't inherit in IE */
legend {
    color:#000;
}