With Vim 8+:

For some specific topic it's often:

To run the tutorial:

The wiki was the first documentation for the plugin, but many pictures are outdated and contain wrong mappings. Still, you can take a look.

You could read at least the Quick Start.

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Some (sometimes very old) random pics:

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Insert mode with autocomplete, alignment (mappings in pic have changed, don't trust them)

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Undo/Redo edits and selections

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Alternate cursor/extend mode, motions (even %), reverse direction (as in visual mode) and extend from the back. At any time you can switch from extend to cursor mode and viceversa.

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Select inside/around brackets/quotes/etc:

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Select operator, here shown with 'wellle/targets.vim' plugin: sib, sia, saa + selection shift

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Synched column transposition

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Unsynched transposition (cycle all regions, also in different lines)

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Shift regions left and right (M-S-<>)

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Find words under cursor, add new words (patterns stack), navigate regions, skip them, add regions with regex.

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Normal/Visual/Ex commands at cursors

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Macros. Shorter lines are skipped when adding cursors vertically.

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Some editing functions: yank, delete, paste from register, paste block from yanked regions

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Case conversion