This is the 2956th most frequent Arabic word.
ولذا
"And therefore" or "hence."
ولذا in this sentence is used as a conjunction to show the cause and effect relationship between being new to the city and asking people for recommendations.
أنا جديد في المدينة، ولذا أسأل الناس عن الأماكن الجيدة للأكل.
I am new to the city, and thus I ask people about good places to eat.
Here, ولذا functions to express a reason or result, connecting the lack of preparation to the audience's reaction.
لم يجهز العرض بشكل جيد، ولذا لم يعجب الجمهور.
The presentation was not well-prepared, and therefore the audience was not impressed.
In this case, ولذا is used to explain the reasoning for the decision to go for a picnic as a consequence of the good weather.