[Noughty]

I tried
{#tags}, {#shelf}

but the result was
,
Just a comma. Without # I get just tags.

My columns are tags and shelf
How to write it correctly?

I also tried
{#tags, }{#shelf}


And
{#tags}{#shelf}

And
{#tags|| , }{#shelf}
And a bunch of others
What's left?

Can someone just tell me what to write in template?

I am also interested how to make template for saving books to disk. I have {author_sort}/{series}/{authors} - {series} {series_index} - {title}

It works fine if a book is part of series, but if it is a single title I get
Author - - Title.
I would like to have
Author - Title.
Is it possible?