For what it's worth means offering an opinion while admitting it may not help. For what it's worth, I agree, and for what it's worth, that is my view.
It is a disclaimer put in front of advice nobody asked for, and it softens what follows without withdrawing it. Written down it is often shortened to three letters in messages.
1phrasefor what it's worthOffering an opinion while admitting it may not help.
“For what it's worth, I think you made the right decision.”
for what it's worth is a qualifier.
From the plain sense of offering something at whatever value the hearer places on it.
The phrase may have originally been used to qualify a statement of advice, opinion, or suggestion by referring to such a statement and describing it separately from making it.
Etymology from Wiktionary, CC BY-SA
Practised in Small Talk & Everyday Phrases