This is the 4888th most frequent Turkish word.
etmeliyiz
"Etmeliyiz" means "We must do" in English.
Here, 'etmeliyiz' is used to imply a necessity for action, specifically putting in effort ('çaba göstermek').
Hayatta başarılı olmak için çalışmalıyız ve çaba göstermeliyiz.
To be successful in life, we must work and put in effort.
The word 'etmeliyiz' is implied in the compound verb 'pekiştirmeliyiz', which involves the action related to making the knowledge firm (consolidation).
Yeni öğrendiğimiz bilgileri pratik ederek pekiştirmeliyiz.
We should consolidate the new information we learned by practicing.
'Etmeliyiz' indicates here the general avoidance of harmful actions, focusing on responsibility and careful consideration.