So many returns......

It may be of some help if someone knows the reason behind the use of (i) Bond Equivalent Yield (ii) Holding Period return (iii) Money Market Yield (iv) Effective Annual Rate/ YTM of annual pay bond (v) Time -weighted return (vi) Money-weighted return (vii) others Because there are so many of them and logic between the use of them becomes fuzzy despite knowing the conversion formulae.