zuletzt
last / lastly
In the last position in a sequence or at the end of a period of time.
Zuerst hat er aufgeräumt, dann gekocht und zuletzt ferngesehen.
First he cleaned up, then cooked, and lastly watched TV.

last / recently
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last / lastly
In the last position in a sequence or at the end of a period of time.
Zuerst hat er aufgeräumt, dann gekocht und zuletzt ferngesehen.
First he cleaned up, then cooked, and lastly watched TV.

'Zuletzt' is a compound of the preposition 'zu' and the adjective 'letzt' (letzte, letzter, letztes). It therefore describes what happens at the 'last' point in time or in the 'last' position.
Die letzte Prüfung war die schwierigste.
The last exam was the most difficult.
The meaning of 'zuletzt' depends on the context. Does it describe the last step in a sequence, often with 'zuerst' (first) or 'dann' (then)? Or does it describe the last point in the past when something happened?
Zuerst die Arbeit, dann das Vergnügen und zuletzt die Ruhe.
First work, then pleasure, and last of all rest.
When 'zuletzt' stands at the beginning of a sentence to mark the last point in a list, the verb follows directly after it (inversion).
Zuerst aßen wir, dann tanzten wir. Zuletzt saßen wir noch lange zusammen.
First we ate, then we danced. Lastly, we sat together for a long time.
The expression 'nicht zuletzt' (not least) does not mean 'not at the end'. It is used to emphasize a final but especially important reason or aspect.
Er ist ein guter Kollege, nicht zuletzt wegen seiner Hilfsbereitschaft.
He is a good colleague, not least because of his willingness to help.
last
'letzt' and 'zuletzt' both have to do with the end or with the last time. The most important difference is grammar. 'letzt' is an adjective and usually comes before a noun, for example 'der letzte Bus' (the last bus) or 'letzte Woche' (last week). 'zuletzt' is an adverb and describes when or at what point something happens: 'Zuletzt haben wir bezahlt.' (Lastly, we paid.) Learners can easily confuse the words because their meanings are similar. Remember: before a noun, it is usually 'letzte/letzter/letztes'; without a noun, as a time or sequence marker, it is usually 'zuletzt'.

Zuletzt haben wir die Küche aufgeräumt.
Lastly, we cleaned up the kitchen.
Der letzte Zug fährt heute schon um zehn Uhr.
The last train leaves at ten o'clock today already.