goddit/templates/post_create.html

            {{define "header"}}
            <h5>Create a new post in</h5>
            <h1 class="mb-0">{{.Thread.Title}}</h1>
            {{end}}

                {{define "content"}}
                <form action=/threads/{{.Thread.ID}} method="POST">
                    {{.CSRF}}
                    <div class="form-group">
                        <label>Title</label>
                        <input name="title" type="text" class="form-control" placeholder="Give your post a great title">
                    </div>
                    <div class="form-group">
                        <label>Text</label>
                        <textarea name="content" class="form-control" rows="3"
                            placeholder="Tell people about your thoughts"></textarea>
                    </div>
                    <button type="submit" class="btn btn-primary">Submit Post</button>
                </form>
                {{end}}