Slovak language: verb 'to be' (Ja som, Ty si ...)

Slovak grammar lesson for complete beginners: How to say I am, You are, He is... . With pronunciation, in (a kind of) story.
This grammatical minimum will, in combination with basic phrases, help you survive in Slovakia.
Basic Slovak phrases are here:

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[darluk]

Dziękuję za te nagrania na temat gramatyki języka słowackiego.

[Roman-SK]

Ono je cestovateľča, pekné :) malý lezúň cestuje.

[bojanbojic]

Ahoj! 🙂
In Serbian language we have double form of present tense of verb to be - long and short form.
Ja jesam / ( ja ) sam
Ti jesi /( ti ) si
On, ona, ono jeste /... ( je )
Mi jesmo /( mi ) smo
Vi jeste /( vi ) ste
Oni, one, ona jesu /... ( su ) .
Long forms we mostly use when we emphasize something, but short forms are much common.

[nilsertorrejon]

Am I the only Spanish Speaker trying to learn this hard but interesting language?

[SkyColl]

So, "oni" is used when there are masculines among "them" and "ony" when there are not. What if we don't know "their" gender, we use "oni"? Is this often mistaken or it isn't a big deal?