This is the 396th most frequent Lithuanian word.
gero
"Good" (genitive singular form of "geras").
In this sentence, 'gero' is used in the genitive case to modify 'kelio' (journey), describing the quality of the journey.
Linkiu jums gero kelio.
I wish you a good journey.
Here, 'gero' functions adjectivally in the genitive case to describe 'mąstymo' (thinking), indicating its positive quality.
Tai buvo gero mąstymo pavyzdys.
That was an example of good thinking.
In this sentence, 'gero' is used in the genitive case to modify 'draugo' (friend), describing the desired characteristic of the friend.