Share capital is Cr in nature, Cr is (+) (think Capital)
Dividends is Dr in nature, Dr is (+) (think Drawings)
Retained earnings is Cr in nature, Cr is (+) (think Income)
You can first forward to 3:40 if you do not need help on how to remember if Dr or Cr is (+) for the 3 accounts.
When business issues shares (usually to raise funds for expansion):
Dr Cash at bank (+A)
Cr Share capital (+)
When business declares dividends:
Dr Dividends (+)
Cr Cash at bank (-A) / Dividends payable (+L)
When business pays dividends which was earlier declared but not yet paid:
Dr Dividends payable (-L)
Cr Cash at bank (-A)
At the end of each accounting year
Step 1: Transfer of profit for the year to retained earnings:
Dr Income Summary
Cr Retained earnings (+)
or Step 1: Transfer of loss for the year to retained earnings:
Dr Retained earnings (-)
Cr Income Summary
Step 2: Transfer of total dividends declared in the year to retained earnings
Dr Retained earnings (-)
Cr Dividends (-)