to do something kind for someone else after receiving kindness
сделать что-то доброе для другого человека после того, как сам получил доброту (sdelat' chto-to dobroe dlya drugogo cheloveka posle togo, kak sam poluchil dobrotu)
"After receiving help from a stranger, he decided to pay it forward by helping someone in need."
"После того как он получил помощь от незнакомца, он решил передать доброту, помогая кому-то в нужде." (Posle togo kak on poluchil pomoshch' ot neznamoktsa, on reshil peredat' dobrotu, pomogaya komu-to v nuzhde.)
someone who learns new things very fast
a balance between two conflicting or competing factors
to form your own opinions and make your own decisions
to feel excited or nervous because of love
to acknowledge someone's contribution or effort
being kind doesn’t take effort or money