telling:

1.

having force or effect; effective; striking: a telling blow.

2.

revealing; indicative of much otherwise unnoticed: a telling analysis of motivation in business.

messing:

1.

a dirty, untidy, or disordered condition: The room was in a mess.

careful:

1.

cautious in one's actions: Be careful when you cross the street.

2.

taking pains in one's work; exact; thorough: a careful typist.

handbook:

1.

a book of instruction or guidance, as for an occupation; manual: a handbook of radio.

2.

a guidebook for travelers: a handbook of Italy.

savvy:

1.

to know; understand.

–noun2.Also, sav·vi·ness. practical understanding; shrewdness or intelligence; common sense: a candidate who seemed to have

showed:

1.

to cause or allow to be seen; exhibit; display.

2.

to present or perform as a public entertainment or spectacle: to show a movie.