'Dayglow' colors would be very bright colors that can be seen easily even in bright daylight. Safety colors worn by construction workers, like blaze orange and safety lime, are examples of 'dayglow' colors. The girlfriend is referring to a style of very bright, inexpensive wall-art that is sometimes associated with teenagers and college students. A Worhol, by contrast, would be a very expensive and sophisticated piece of wall-art.

People from the US will generally not know what you are talking about if you refer to a show as a 'serial'. We pretty much never use 'serial' as a noun, and it will probably sound to them like you are saying 'cereal'. Here, we call that a 'series'. Pretty much the rest of the English-speaking world calls it a 'serial', but you know we always have to be different.

'Recap' is short for 'recapitulation', and can be used as both a verb and a noun. It is a term that is used frequently by sports announcers. "Let's go to Bob for the recap" is a very common way for the word to be used in the context of sports or some other form of commentary. One could also say "I had to miss the meeting, but Karen recapped the important parts for me". To recap and to give a recap can be used interchangeably. It is also proper to use the full word 'to recapitulate' or 'to give a recapitulation', though it sounds kind of odd because it is used less frequently than the shortened version.

Audience comes from the Latin word for listening and Spectator comes from a word for seeing or looking. In general usage, a spectator can be an individual but an audience is a group that is present to listen or view a speaker, presentation, play, movie, etc. Spectator is usually used in sports, but can be anyone who is looking at anything.

In the US, we usually call that a "wire transfer".

Negotiation is one of the most advanced skill-sets related to business English. More challenging negotiations will require you to read your counterpart's emotions and see past what they are saying directly. Negotiations can also involve a lot of pressure on all participants and the potential for hostility. I can't tell you a specific book to read, but Harvard has a Program On Negotiation which recently published a reading list on their blog: https://www.pon.harvard.edu/daily/negotiation-training-daily/negotiation-books-a-negotiation-reading-list/

Hi, Sandra is correct, but it is also used to describe a period of time. Apple was making computers as far back as the 1970's, however they did not start making phones until 30 years later.

Hi, 'In it's own right' means 'without relying on anything else'. It is usually used to convey the idea that something has a merit on its own rather than having the merit through an association with someone or something else.