19. According to DLE in de nada it's a polite answer to thanks being given to somebody. Basically it's kind of equivalent to it was nothing / think nothing of it / no problem / don't mention it. In Spanish you can also say no fue nada (and in that sense that sounds more "complete"), por nada, no hay problema; so basically de nada and the other
1. vote. Te quiero means: " I want you " Te amo means " I love you " Mucho means " A lot " Linda means " pretty/beautiful ". I can say this, 'cause I'm Brazilian. And brazilians can understand a lot of words in spanish, 'cause they are very similars. Obs: Te quiero and mucho is a spanish words. And "te amo" is a portuguese words.
What does mucho gusto mean in engligh? "Mucho gusto" is a fixed expression in Spanish that corresponds with the English fixed expression "pleasure to meet you". It literally means "lots of liking".
Here mucho is very. In the other example muchas gracias does mean thank you VERY much where again muchas is very. So now you can see that in both cases mucho, mucha means very for masculine and feminine respectively and muchos, muchas are the same but for the plural. In general mucho means a lot, very, much