1) Otricatelьnыe mestoimeniя i nareciя russkogo яzika
-nibudь
-to
kto-to someone
kto-nibudь anyone

book, language, and russian image

gde-to somewhere
gde-nibudь anywhere
Other substitutes:
Kogda
Cto
Necto
Komu
Kakie..

2) When we talk about verbs of movement,
Russian people are very precise. Example verb go(idti):
voйti v klass,na stadion(get in)
vыйti iz klassa,so stadiona(get out)
priйti v kino,na koncert(approach somewhere)
uйti iz kino,s koncerta(it means go somewhere far away)
This is all prefixes...we have also:
pere(pereйti ulicu-cross the street)
pro-pass by
po-go now
raz-split up
oto-get away
obo-pass one circle
za-come by
do-come to somewhere
s-go down
vzoйti-climb

sunset, sky, and nature image

I hope you will understand this...Russian is beautiful language and a little hard. Thanks for reading this. :)