I'v learned Spanish alphabet last week, and review this week.
Only C D G X has two kinds of pronunciation, right?
C: g, θ
D:d, ð
G, g, h
X, sh, gs
What's my next should learn?
The grammar?
The R (la erre) --- It is difficult to pronounce and appears to have more than the 2 official variations.
You should continue with subject pronouns (yo, tú, él,...), verbo 'ser', and some regular verbs. Numbers and countries/nationalities are also a good choice for the early lessons.