My way is a little strange, I look at the clock and represent the date for example 12:21 battle on Kalka. 19:14 the first world war. And so on. And I can also recommend short series "History of the Russian State"
Connecting to the answer above: somehow I was traveling in public transport and observed a girl sitting next to her, who was probably preparing for an exam in Russian history. So she had a large notebook in which she wrote all the dates and events in different handwriting, size and different colors with bright felt-tip pens / markers. This is probably the way to remember.
For dates, you can try mnemonic techniques: choose a room that you know very well, for example, your apartment. Imagine you come home and do something. Now follow your path and assign a historical event to each action. Write the event and date on a sticker and paste it over there. For example, you need to remember the Russian rulers. At the front door you hang Rurik with the dates of his reign, on the rug for the shoes of Prophetic Oleg, on the hanger for Igor's clothes, Olga on the switch in the bathroom, etc.