A little guidance.
Back to your writing.

Getting started

• Create a new tab with ⌘N, open a file with ⌘O, or drag files onto the window.
• Save with ⌘S; Save As with ⇧⌘S; close a tab with ⌘W.
• Unsaved changes survive a relaunch. They are written to the document only when you save with ⌘S. The window subtitle shows “Unsaved changes” or “Saved”.
• Switch tabs with ⌃Tab / ⌃⇧Tab.

Writing Markdown

• The left toolbar includes H1–H3 headings, bold, italic, strikethrough, inline code, links, images, bullet/numbered/task lists, quotes, outline and the emoji palette. Markdown formatting tools, list tools, outline and palettes require Pro.
• Return continues a list. On an empty item, Return reduces indentation. Tab nests an item; ⇧Tab outdents it. This also works with a multiline selection.
• Live preview (Pro): toggle it with ⌥⌘P. Synchronized scrolling is in the View menu.
• Outline (Pro): ⌥⌘O. Click a heading to jump to that line.

Code and data files

• The tool rail adapts to the file type. HTML, CSS, JSON and CSV format buttons are free. JSON insertion buttons add commas automatically to keep the document valid.
• Snippets (Pro): choose built-in snippets or My Snippets. New Snippet… creates a snippet from selected text. Manage snippets in Settings › Snippets, and show each one in all files or only one format. In the snippet text, $SELECTION inserts selected text and $CURSOR sets the insertion point.
• Scriva detects the language from the file extension. Change it using the language menu in the status bar.
• JSON (Pro): tree view, validation and error location, Format / Minify.
• CSV/TSV (Pro): table view, automatically detected delimiter, and a “First row is header” option.
• HTML (Pro): local preview; remote resources are blocked for security.
• For files with very long lines, such as minified JSON, highlighting turns off to keep editing smooth. A warning appears in the status bar.

Folders and searching across files

• Add a sidebar folder with ⇧⌘O: one folder is free, unlimited folders require Pro. Toggle the sidebar with ⌃⌘S.
• Find in Folders… (Pro): ⇧⌘F. Choose case-sensitive, whole-word or regex matching. Preview each match before replacing and select matches individually. Changes in open tabs can be undone with ⌘Z. Scriva asks for confirmation before changing closed files.

Display

• Zoom in / out / actual size: ⌘+ / ⌘− / ⌘0. You can also use ⌘ or Ctrl with the scroll wheel, or pinch on a trackpad. Zoom applies to the pane under the pointer.
• Preview zoom: ⌥⌘+ / ⌥⌘− / ⌥⌘0.
• Word wrap: ⌥⌘W. Line numbers: ⌥⌘L.
• Interface language: Settings (⌘,).

Exporting and printing

• File ▸ Export as HTML… / Export as PDF… (Pro).
• Page Setup: ⇧⌘P. Print: ⌘P.

Scriva Pro

• Choose Scriva ▸ “Unlock Scriva Pro…” to open the purchase screen.
• Restore purchases: choose “Restore Purchases” on the purchase screen. Use the same Apple Account on a new Mac.
• Manage or cancel your subscription: Scriva ▸ “Manage Subscription…” or App Store ▸ your account ▸ Subscriptions. Open Apple subscription settings.
• Apple handles refunds: reportaproblem.apple.com.