when you take your 2nd base send half your workers from your main and DON'T rally workers to the expansion.
with constant worker production they will both be saturated at the same time and you only lose mining time from the first transfer instead of constantly.
Macro is simply build workers and spend your money, as long as you keep an eye on your resources then macro should be the easiest part of the game. micro on the other hand ... :P
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