Wiktionary does not have a "notability" criterion; rather, we have an "attestation" criterion, and (for multi-word terms) an "idiomaticity" requirement.
Our "attestation" requirement is much less subjective than Wikipedia's "notability" requirement; and we include all terms in all languages, including very obscure or rare terms, provided they meet our criteria for inclusion (CFI).
Wiktionary documents words and phrases itself without relying on the statements of other people.
On Wiktionary we ask "do we think it is the case?". This also means that whereas Wikipedia discourages original research and relies on the research of others, Wiktionary users themselves actively research terms and their meanings.
Discussion is usually centralised in Beer Parlour, Tea room and other discussion rooms.
Wiktionary allows only userboxes that are relevant to your work on Wiktionary itself.
Wiktionary makes heavy use of templates for all kinds of things, and each language often has its own set of templates. Learning to use the templates of the language you are working on is very important, and can be found at Category:Templates by language. Categories, formatting and linking also often use templates for consistent formatting.
Wiktionary uses language codes extensively for any language-specific purposes involving templates. For example, many templates use en to refer to the English language, or cmn to refer to Mandarin Chinese. Knowing the code of the language you are working on is very important, and necessary for almost any kind of editing on Wiktionary.
On Wiktionary, categories are often added to pages by the templates used on that page, so there is no need to put them directly on the page. In particular, headword-line templates and context templates are most commonly used to add entries to the appropriate categories.