docs: add a Tips and Tricks page

docs/help/tips_and_tricks.md

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+---
+layout: default
+title: Tips and Tricks
+nav_order: 9
+parent: BetterVoting Documentation
+---
+
+{:toc}
+
+# Tips and Tricks
+
+Small things that make an election easier to read, easier to trust, and easier to share. None of these are required — they're the details that are easy to miss on your first election.
+
+## Put links in your description, not just a URL
+
+The **election description** and each **race description** are formatted, so you can add a real, clickable link:
+
+```
+Read the full proposal at [our website](https://example.org/proposal).
+```
+
+A bare URL is **not** turned into a link. If you write this:
+
+```
+Read the full proposal at https://example.org/proposal
+```
+
+voters see the address as plain text and have to select and copy it by hand. On a phone that is a real obstacle, and it is the single most common way a description ends up less useful than it should be.
+
+The same formatting also gives you:
+
+| What you type | What voters see |
+|---|---|
+| `[click here](https://example.org)` | a link, opening in a new tab |
+| `**important**` | **important** |
+| a blank line between two paragraphs | two paragraphs |
+
+Links open in a new tab, so clicking one never takes a voter away from a ballot they're partway through filling in.
+
+## Know where each description actually appears
+
+The two description fields show up in different places, which is worth knowing before you decide what to write where:
+
+| Field | Where voters see it |
+|---|---|
+| **Election description** | the election's home page, the card on **Browse Polls**, and email invitations |
+| **Race description** | on the ballot, under that race's title |
+
+{: .note }
+> Neither description appears on the **results** page. If you want people reading the results to find your background material — a proposal, a rules document, an explanation of how the count works — link to it from somewhere that survives the election, and share that link alongside the results link.
+
+## Titles are plain text
+
+Election titles and race titles are shown exactly as typed. Formatting and links don't work there, so `[my org](https://example.org)` in a title will display as those literal characters, brackets and all. Keep titles short and descriptive, and put anything else in the description.
+
+## Give candidates their own link
+
+Candidates have a dedicated **link** field — you don't need to put candidate URLs in the description. When it's set, the candidate's name on the ballot becomes a link to that page, with a small "opens in a new tab" icon beside it. It's the tidiest way to let voters research a choice without leaving the ballot, and it keeps your description short.
+
+There's a separate field for a party affiliation link, which behaves the same way.
+
+## Say what happens in a tie, before you start
+
+Ties are rare in STAR Voting, but they're much easier to handle if the rule was agreed in advance rather than argued afterwards. See [Ties](ties.html) for the protocol BetterVoting uses and the reasoning behind it.
+
+## Test with a draft first
+
+Send yourself the ballot link and vote on it before you invite anyone. It takes a minute and it catches the things that are awkward to fix later: a candidate name that's ambiguous on a small screen, a race description that's too long to read on a phone, a link that points at the wrong page.
+
+---
+
+*Something here out of date, or a tip you think belongs on this page? Corrections are welcome — see the [contribution guide](../contributions/0_contribution_guide.html).*