I learned R stuido 2 years ago, and I want to study it again from basics to advanced level.
Tell me if you know any recommendations.
Here's a list of free books you can use 
Start with one of these
- R For Data Science (Garrett Grolemund and Hadley Wickham)
- An Introduction to Statistical and Data Sciences via R (Chester Ismay and Albert Y. Kim)
Explore specialised topics
-
Advanced R (Hadley Wickham)
- This is very much a "go under the hood with R" sort of book; it shows you a bunch of R's subtleties.
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Geocomputation with R (Robin Lovelace, Jakub Nowosad and Jannes Muenchow)
- Go straight here if you need to work with spatial data!
-
Forecasting: Principles and Practice (Rob J Hyndman and George Athanasopoulos)
- Fantastic for time series analysis
-
R Markdown: The Definitive Guide (Yihui Xie, J. J. Allaire and Garrett Grolemund)
- An important reference if you plan to do writing in R Markdown
-
Efficient R (Colin Gillespie and Robin Lovelace)
- Alternate title: "Make R go fast"
-
R Packages (Hadley Wickham)
- Go from writing functions to authoring and distributing packages
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