If you are new to the field of programming, then you must start by learning the basic concepts of R programming. You have to try to focus on implementing every basic concept that includes variables, data types, operators, data structures, vectors, lists, matrices, strings, functions, loops, and control flow statements. After this, you can move on to the main purpose of R programming; the manipulation and visualization of data. For starting with R programming, you need to import a dataset and apply data cleansing on it. Then, you can start using various packages and libraries present in R to manipulate and visualize the data. This will help you get started with R programming.
If you are looking for an online course to learn R programming, check out this R Programming Certification program by Intellipaat.