How do you validate a service idea when the market already has big players? i will not promote

How do you transition into a PM role in climate/cleantech space without prior PM experience? ( i will not promote )

Update: Investor offered 1m for 25% - I will not promote

Is there a reason for the "I am making X startup, watch me" videos? I will not promote

i will not promote, Would you ever date your co-founder? Honest opinions wanted

i will not promote, Would you ever date your co-founder? Honest opinions wanted

Thinking of building a free tool that audits your landing page before launch, would you use it? I Will not promote