There are four ways to stress a noun.

The first way (1st paradigm) is always stressing the noun in the stem:

lempa
lempos
lempai
lempą
lempa
lempoje
lempa!

lempos
lempų
lempoms
lempas
lempomis
lempose
lempos!

The second way (2nd paradigm) is mainly stressing the noun in the stem, but sometimes in the ending:

pieštukas
pieštuko
pieštukui
pieštuką
pieštuku
pieštuke
pieštuk!

pieštukai
pieštukų
pieštukams
pieštukus
pieštukais
pieštukuose
pieštukai!

The third way (3rd paradigm) is sometimes stressing the noun in the stem, but mainly in the ending:

kambarys
kambario
kambariui
kambarį
kambariu
kambaryje
kambary!

kambariai
kambarių
kambariams
kambarius
kambariais
kambariuose
kambariai!

And finally the fourth way (4th paradigm) is like the 3rd, but it has even more stressing in the ending:

stalas
stalo
stalui
stalą
stalu
stale
stale!

stalai
stalų
stalams
stalus
stalais
staluose
stalai!

Each Lithuanian word is stressed by one of the paradigms above. When you learn a new word, you should also memorize its stressing paradigm. In most dictionaries, the paradigm number should be next to the word, for example: lempa (1), pieštukas (2), kambarys (3), stalas (4).

In other lessons we will cover all the four ways of stressing.