R is required for this question. Can someone walk me through how to solve this?

Load and read the documentation for the Boston data set from the MASS package. We want to build a model to predict the per capita crime rate. Implement the methods of (1) best subsets, (2) forward and (3) backward stepwise selection, (4) LOOCV, and (5) k-fold cross validation to build models (use k = 10). Compare and discus the models