Which industries to avoid and why?

Airlines - Capital intensive, low roic, strikes, oil price

Banks - I do not understand their dept portfolio and risk

Insurance- tough business, I can not differentiate the competitive advantage of each other

Car manufacturer- low roic, capital intensive (except Ferrari (RACE))

BioTech- too difficult to understand

Touristic industry- (except maybe booking.com or some sort of low capital intensive toll company)