  We present in this paper some embeddings of various dyadic martingale
Hardy-amalgam spaces $H^S_{p,q},\,\,
H^s_{p,q},\,\,H^*_{p,q},\,\,\mathcal{Q}_{p,q}$ and $\mathcal{P}_{p,q}$ of the
real line. In the same settings, we characterize the dual of $H^s_{p,q}$ for
large $p$ and $q$. We also introduce a Garsia-type space $\mathcal{G}_{p,q}$
and characterize its dual space.
