FRIEND

1. being honest

1.1. not being afraid to tell the truth

2. standing by each other

2.1. protecting

2.2. knowing what's best for them

2.3. comfort when they doubt themselves

3. knowing each other like no-one else

3.1. giving advices

3.2. accepting different opinions

4. forgiveness

4.1. not being afraid to make mistakes

4.2. understanding other's point of view

5. trust

5.1. sharing secrets

6. timeless

6.1. can be 2 weeks long, can be 2 decades long

6.2. doesn't matter what happens, it lasts

7. relationship

7.1. friendship

7.2. family

8. school

8.1. eating lunch together

8.2. classmates

9. holidays

9.1. trips

9.2. visiting new cities and countries

10. having both ups and downs

10.1. being ok with not being perfect

10.2. ability to say "sorry"

10.3. helping in need

11. spending time together

11.1. same taste in films/music/food

11.1.1. going to social events together

11.1.2. sharing new music

11.2. gossips

11.3. sharing hobbies

11.3.1. playing sports together

11.3.2. partying together

11.3.3. watching movies

12. ability to spend time in silence

12.1. understanding each other without words

12.2. being ok with not receiving/giving 100% of attention

13. laughter

13.1. same sense of humour