へ is a particle used when describing a place that someone or something is 'moving toward', or 'in contact with'. In many cases, the particles に and へ are interchangeable, but there is a slight difference in meaning. へ focuses more on the distance/effort required to get between (A) and (B), while に focuses more on the connection between (A) and (B). へ always comes after the noun signifying the destination.

In these examples, while they may seem the same at first glance, へ shows that there is a space between (A) and (B), while に puts the emphasis solely on the destination. This is why common expressions such as 'city/country name へようこそ' sound very polite. It is like saying 'Welcome, and we acknowledge your journey/effort to get here'.

In the TV-show example, this commonly means 'thank you for your effort to watch this particular show, out of all the ones you could have chosen'.

へ行(い)く is a common construction used when describing a place that someone/something is 'heading'. The particles に and へ are mostly interchangeable, but there is a slight difference in meaning. に has the nuance of 'going to', while へ has the nuance of 'heading to'.

In these examples, while they may seem the same at first glance, へ focuses much more on the journey, while に puts more emphasis on the destination. This is true for other uses of に and へ as well. に will always put more focus on the destination of an action, where へ will put more emphasis on the distance traveled/between the origin and destination.

来(く)る is one of only two main verbs in Japanese that do not follow the standard rules of conjugation for Godan and Ichidan verbs. The other primary verb being する. 来(く)る means 'to come', or 'to be coming'.

来(く)る will always have the particle に or へ attached to the location that someone 'will come', or 'has come'.

The reason that 来(く)る is called a か-column irregular conjugation verb in Japanese is because the る in 来(く)る does not conjugate, but is dropped. This leaves the く being the part that conjugates. Because of this, 来る has qualities of both る-Verbs (the る being dropped), and う-Verbs (the remaining く changing depending on the conjugation). Here are some examples of how 来(く)る changes.

（き）た, （く）る, （こ）ない.

来(く)る will often be seen as 来(き)ている when someone has come to a place and remains there. This is due to ている meaning 'to exist in the state of an action', rather than being exactly the same as '(A)~ing' in English. Because of this, 来(き)ている can mean either 'to be somewhere that one has come', or 'to be coming'.

Sometimes the difference between these two will not be clear unless there is further context.

する verbs are one of only two main verbs in Japanese that do not follow the standard rules of conjugation for Godan and Ichidan verbs. The other primary verb being 来(く)る. する means to do something, or to make something a certain way.

する will almost always have the particle を attached to the thing that is being done (depending on the form of the verb). The reason that する verbs are called さ-column irregular conjugation verbs in Japanese is because the る in する does not conjugate, but is dropped.

This will leave す to be the part that conjugates. Because of this, する has qualities of both る-Verbs (the る being dropped), and う-Verbs (the remaining す changing, depending on the conjugation). Here are some examples of how する changes.

（さ）せる, （し）ます, （す）る, （せ）よ.

We will learn more about each of these conjugations of する, and their individual meanings at a later stage. For now, let's take a look at the polite します conjugation.

In a broader sense, する can be thought of as meaning 'to do something that has an external effect'.