Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday: pirmadienis, antradienis, trečiadienis, ketvirtadienis, penktadienis, šeštadienis, sekmadienis.

Nouns

Like in many other languages, the Lithuanian noun posseses two genders (masculine and feminine) and two numbers (singular and plural). However it has five declensions, what means lots of endings to memorize.

There are seven cases in Lithuanian:

Nominative (vardininkas)
Genitive (kilmininkas)
Dative (naudininkas)
Accusative (galininkas)
Instrumental (įnagininkas)
Locative (vietininkas)
Vocative (šauksmininkas)

You are going to come across them occasionally, so it would be good to get acquainted. Cases might seem hard for English speakers and for those, whose native language does not have cases, but actually they are not as hard as they look, so do stick with them.

Let's get to know what cases really are.
If you're completely sure what cases are, then you may skip them and meet the five declensions.