what do you do for living? it is right say "what do you do for A living?" or better remove "a" ?

ONTO preposition sto studiando le preposizioni inglesi (di luogo, di tempo e di movimento) non vedo molte difficoltà, devo solo impararle :) tuttavia Onto non riesco ancora a capire come e quando usarla. il libro dice: "indica un movimento che porta dal "non essere sopra a qualcosa" fino "all'essere sopra a qualcosa, toccandolo" ex: The lampshade fell onto the table. non avendo capito bene la spiegazione ho provato a guardare in internet e onto me lo traduce come "su,sopra"... qualcuno riesce a spiegarmi il significato di Onto in maniera più chiara? grazie I was studying english prepositions (of place, of time and of movement) I don't have much difficult, I only need to study it :) anyway, I don't really understand what does it mean the word Onto. my book write "suggest a movement that carrying to "don't be over something" to " be over something, touching it" unfortunately I don't really undertand. anyone can help me please? thank you :)

an, a, the last week I bought a book by Jonh Peter Sloan for learn english. I read the first chapter talk about indefinite and definite article (a,an,the) now I try to make some exercises to translation 1) Concy è a casa. Concy it's at home 2) vado al lavoro con l'autobus. I go to work by bus 3) lascio sempre i miei libri all'università. I always leave my book at university 4) torno dal pub a piedi. I return to the pub on foot 5) la mia giacca è al lavoro. my jacket it's at work 6) io prendo il treno per arrivare alla chiesa. I get the train to arrive at the church 7) per andare al college vado a piedi. to get to college I go on foot 8) sono a due minuti da casa. I'm at two minutes to home 9) io lavoro da casa. I work to home 10) vado a letto perché sono tornato da scuola a piedi. I go to bed because I'm return to school on foot I'm not very sure to chose the right answer :)

to knock wood to knock wood in italian you can translate in "toccare ferro" (atto scaramantico) but wood doesn't mean "legno"? so why we say "knock wood" and not "knock iron"? iron = ferro wood = legno I don't understand :D

to put one's best foot forward on internet I found a phrase that say this "to put one's best foot forward" (fare buona impressione) then there was a example, but ih the example the phrase was : "listen today the president of our company is coming to pay us a visit. i want you all to put your best fooD forward!" it's right write "food" or it is a mistake?