This is the 697th most frequent Russian word.
вошли
"Вошли" means "entered" in English.
Here, 'вошли' is the past tense, plural form of the verb 'войти' (to enter), indicating the act of moving into the house at a certain moment in the past.
Они вошли в дом.
They entered the house.
Here, 'вошли' is used in the sense of being included or incorporated into a program or content, again in the past tense.
В программу вошли новые темы.
New topics were included in the program.
In this sentence, 'вошли' suggests the initiation or beginning of discussion, similar to entering the phase of talking about the plan.