Good job! By the way, R also supports specific assignment operators, like `<-` and `->`. At this stage, there is no difference between any of these operators. We will return to this issue when will learn functions.

Using `<-` is equal to using `=` in terms of placements, i.e., variable name on the left side and value on the right. While using the `->` operator, the order is vice versa. For example, there are three ways to assign the value `2020` to the variable `year`:
```
year = 2020
year <- 2020
2020 -> year
```

Despite the fact that the last way of assignment works, it's not recommended to use it since it worsens the code readability.

> **Agreement: in the following chapters we will consider only left-arrow (`<-`) and equal (`=`) assignments!**

In the first section, you will consider the very basics of R - outputting and performing basic operations. You will finish the section with the variables theory.

In the second section, you will learn the vector class in R, which represents single values too. You will consider the main data types for single values and how to work with multiple values of a kind at once.

Factors (or categorical variables) are widely used in real life. These are blood types, currencies, nationalities, brands, etc. Unlike numerical variables, factors are limited to a finite number of values.