They all are correct, with kukaa or kuketi is just a matter of preference, because kukaa also means to stay(live) or to stay( for taking long) some people might prefer using keti instead but it totally depends with the person because they are basically synonyms.

Mara yangu kwanza kuandika Kiswahili - My first time writing in Swahili

Habari za jioni, jina langu Beth. ninaishi Canada, nina miaka ishirini na moja. ninataka kujifunza Kiswahili kwa sababu ninataka kwenda kutembelea Tanzania au Kenya. Nina marafiki kutoka huko  wanaonisaidia kujifunza pia. Ninapanga safari mwaka mmoja kutoka sasa kutembelea familia yangu nchini Ethiopia, kwa hivyo ninatumaini kuwa ninaweza kutembelea wakati huu. Kwa kuwa mimi ni Mwanzilishi kamili, uandishi wangu ni wa utafsiri. Hapo chini, nitatafsiri kwa lugha ya Kiingereza ili niweze kueleweka zaidi. Asanteni kwa msaada wenu!

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Good evening, my name is Beth. I live in Canada, and I'm 21 years old. I want to learn Swahili because I want to visit Tanzania and Kenya. I have some friends from there who are helping me as well. I'm planning a trip in a year to visit my family in Ethiopia, so I hope that I can visit during this time. Since I'm a complete beginner, my writing is based on translations. At the bottom I will write the same thing in English in case it makes what I'm trying to say more clear. Thank you for the help!

Introducing myself

Hujambo?

Iv have just started to learn swahili and was hoping somone would be able to look and correct the below.

Asante sana

Mimi ni Ruth. Nina miaka ishirini na mitano. Ninatoka Uingereza. Sizungumzi kiswahili vizuri, bado ninajifunza.

Mtoto huyu  hakula

Dada yangu amefurahi

Mama ako sifunzai (what did you mean to say by this?)

Je, mlikula?