I wanted a full text RSS feed, posts to be tagged and readable formatting!
Heres the code I put into my layouts/index.rss.xml
file:
{{- printf "<?xml-stylesheet href=\"/rss.xsl\" type=\"text/xsl\"?>" | safeHTML }}
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:content="http://purl.org/rss/1.0/modules/content/">
<channel>
<title>{{ if eq .Title .Site.Title }}{{ .Site.Title }}{{ else }}{{ with .Title }}{{.}} on {{ end }}{{ .Site.Title }}{{ end }}</title>
<link>{{ .Permalink }}</link>
<description>Recent content {{ if ne .Title .Site.Title }}{{ with .Title }}in {{.}} {{ end }}{{ end }}on {{ .Site.Title }}</description>
<generator>Hugo -- gohugo.io</generator>
{{ with .Site.LanguageCode }}<language>{{.}}</language>{{end}}
<managingEditor>{{ with $.Site.Author.name }} ({{.}}){{end}}</managingEditor>
<webMaster>{{ with $.Site.Author.name }} ({{.}}){{end}}</webMaster>
{{ with .Site.Copyright }}<copyright>{{.}}</copyright>{{end}}
{{ if not .Date.IsZero }}
<lastBuildDate>{{ .Date.Format "Mon, 02 Jan 2006 15:04:05 -0700" | safeHTML }}</lastBuildDate>{{ end }}
{{ with .OutputFormats.Get "RSS" }}
{{ printf "<atom:link href=%q rel=\"self\" type=%q />" .Permalink .MediaType | safeHTML }}
{{ end }}
{{ range .Paginator.Pages }}
{{ if and (.IsPage) (.Params.date) }}
<item>
<title>{{ .Title }}</title>
<link>{{ .Permalink }}</link>
<pubDate>{{ .Date.Format "Mon, 02 Jan 2006 15:04:05 -0700" | safeHTML }}</pubDate>
<author>{{ with $.Site.Author.name }} ({{.}}){{end}}</author>
<guid>{{ .Permalink }}</guid>
<description>{{- .Description | html -}}</description>
<content:encoded>
{{ `<![CDATA[` | safeHTML }}
{{ .Content }}
{{ `]]>` | safeHTML }}
</content:encoded>
{{ range .Params.tags }}
<category>{{ . }}</category>
{{ end }}
</item>
{{ end }}
{{ end }}
</channel>
</rss>