Hi, nice to meet you. Ecency Points can be used
for BOOST - ( I know @dandays is not a fan of self boost but) also boosting for you own content is okay. But on the other hand you also can see the BOOST as if you where a Whale and can give nice upvotes to people you think deserve a little more.
Boostings are not guaranteed, there are curators looking if the vote/worth and content/effort is okay. If you dont get the boost, your ecency points will be refunded within 24h.
PROMOTING - I personally am not a big fan of promoting "Normal" content. I would just use it for contests or something that could be interesting to the majority of hivers. But it's totaly up to you.
Promoting can be choosen for 1 - 14 days, but as Dandays said, longer then 2 days make no sense, even can lead to downvotes if people see it too often.
TIP - if youre online with ecency and look at the end of each post, you also find the little present symbol. click it and you can choose to send HIVE HBD or ECENCY POINTS to the blogger as a present.
for ecency questions you also find us in ecency discord https://discord.gg/P9qPDCY4
As I see you also post in German, you could think to use the #deutsch tag. This is the tag most german speaking hivians from DACH look into.
Greetings from Austria :-)