I agree saving R objects through
saveRDS() rather than
save() is good practice, as others have recommended. What does the term RDS stand for, though? Is it an abbreviation for "R data single" or "R data serialized"? (https://stat.ethz.ch/R-manual/R-devel/library/base/html/readRDS.html)
Not that it matters a whole lot, but spelling out abbreviations can be useful when teaching.