The particle -(으)로 designates the direction of movement or the means with which you do a certain action. The particle is a must know in Korean grammar.
Korean particles, also known as Korean postpositions, are fundamental in Korean grammar. They are the first major hurdle any Korean language learner has to conquer.
Korean particles can serve a variety of purposes, though, you can divide them into two groups: grammatical particles and informational particles. The grammatical particles, like -은/는 and -을/를, indicate the (grammatical) function of a noun in a sentence. Whereas informational particles, like -쯤 and -마다, add a little more context to their nouns.
Regardless of the type of particle, you attach all particles to nouns and sometimes adverbs like 지금 (now). Verbs and adjectives do not use particles whatsoever.
Also, keep in mind that certain particles have a horrific counterpart you need to use when appropriate.
-(이)나 is the particle you use to give a list of choices between two or more items. It can also express the number of things is greater than expected.
The particle -까지 is a handy particle that indicates the destination or the end time of an activity. It is often paired with -에서 (location) or -부터 (time).
The particle -도 is a basic particle that expresses that a word does or undergoes the same thing as something or someone mentioned earlier.
-마다 is a simple particle that allows you to indicate the time interval. Or, you can use it to state facts about something that is true for all of something.
The Korean particle -만 indicates that something is the only thing or option to the exclusion of everything else. With numbers, it can indicate a minimum.
The Korean particle -밖에 indicates something is the only option and there is no possibility of anything else. It is also an inherently negative particle.
The particle -보다 is a simple way to express a comparison between two objects, persons, etc. It is a very simple particle to learn how to use.
The particle -부터 gives the starting time of an event or action. It is therefore often paired with the particle -까지, which then indicates the ending time.
The particle -에 is an important Korean particle. You use it to indicate where an action or event takes place or indicate the time when something happens.