las cosas en general
generalmente
Tan generoso.
cosas divertidas
Me encantar hacer cosas (I love to do things)
To say 'bag' in Spanish, you will say 'mochila'. This only applies for school bag. The general term for "bag" would be "bolsa".
Las cosas que hago.
Since "are" is not a Spanish word, I assume you mean "What is the Spanish word for 'are'?" Are in Spanish is either son or están. They are used in different ways, but a general rule is that son is used for things that are permanent, and están is used for things that are temporary.
Sido or estado. Sido is for permanent things. Estado is for temporary things.
You could say "Cosas que hago diariamente".
you say: "necesitamos mejorar algunas cosas"
Muchas cosas maravillosas.
como funcionan las cosas