find . -type f -size +100M 2>/dev/null |-> recursively find files > 100 MB in size in the current directory
find . -type d "name" |-> find directory with name "name"
grep -nr 'foo*' . |-> recursively find 'foo*' (regex) inside all files in the current directory
rsync -av --exclude='path1/to/exclude' --exclude='path2/to/exclude' source destination |-> copy excluding directories
du -sh |-> a summary of file space usage in the current directory
top -p 'pid' |-> show memory usage
git branch -a |-> list all remote branches
git checkout branch_name |-> switch to branch_name