Between 1, 2, and 3: 1 and 3 are correct. As you say, you can totally write "I am (not) done with something". As for 4: That would be another wording for 3, since you exchanged done with finished. Here you also need the "with": I am not finished with task B. However, I think it would sound more natural to say I haven't finished task B (another wording for 1) if you want to use the word finish. Between 6 and 7, 7 is the correct way of wording what you're trying to say. Hope it helped!

Hi! Here is my take on translating your letter. Hope I understood everything you wanted to say!_ Trabajé en un supermarcado y lo dejé ya que quería crecer y ponerme nuevos retos. Mis puntos fuertes son: soy agradable, positiva, y me gusta trabajar con gente. Mis puntos débiles son: (you can add whatever here :) ) Vine en transporte público y pude encontrar tu oficina fácilmente (here I translated your sentence, but if you want to say you'd go to this office to work by public transport and that it is easy for you to get there, I'd say: Puedo venir a la oficina en transporte público fácilmente). Ya he completado un grado (do you mean you have another degree besides tourism already?). Ahora estoy estudiando turismo y gestión y estoy en mi tercer curso.

Holaa! Me encantaría ayudarte con tu español! Yo estoy empezando con el francés así que sería perfecto :)

Almost and nearly basically differ on how you use them, because the meaning is practically the same. There are sentences in which both can be used, such as: It's almost/nearly time to go to bed, almost/nearly all my friends will be there. Neraly, however, is not used for negative sentences, so when saying things like "Almost nobody was there / she's almost never on time" we use almost. (With never, no, anything, nothing, nobody...)

Number one isn't correct when used on its own, it sounds more like it should be a part of some other sentence, such as: "Ayer me encontré a tu vecino, que mira qué casualidad, es mi amigo". The first "que" should refer to something that has been said before. Sentences two and three mean the same and are both correct.

Yes, it is totally correct! Actually, changing the pronoun is even better than using "who", since "who" refers to people, as Alice said. In this sentence, I'd use "that" since it sounds more natural!