Opinions
Metaphors
Metaphors
Idioms
Learning and experience
100

something which makes you willing to listen to
or accept new ideas

an open mind

100

not very intelligent  

dim

100

intelligent

bright

100

argue a point of view just to
create discussion

Play Devil's advocate

100

act according to your personal feelings about smth

go with your gut feeling

200

an idea or opinion formed before enough information is available to form it correctly

preconception

200

something to think about

food for thought

200

start a series of adverts to sell something

launch a campaign

200

to avoid talking about what is important

Beat about the bush

200

A problem that prevents or delays progress

A setback

300

a way of looking at something

Perspective

300

have a great future

go far

300

get a lot of money very quickly (metaphor)

make a killing

300

have no opinion either way

sit on the fence

300

challenging rate at which you need to learn
something

Steep learning curve

400

a person who has strong views and tells others
about them

opinionated

400

create (a theory)

construct

400

having an important decision to make  

be at a crossroads

400

to say honestly what you think, even if it upsets or offends someone

speak your mind

400

find out how to do a job or activity

learn the ropes

500

to change your opinion about something or start to doubt it

have second thoughts

500

repeat what you have heard without thinking about it

Regurgitate

500

an insecure base on which to base ideas
(metaphor)  

weak foundations

500

to have a strong personal opinion about something that you want people to accept and that is the reason why you do something

Have an axe to grind

500

Become familiar with a new situation or experience

Find your feet

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