how can know update news and trend information for crude and ng trading
Market-moving data, as for any other commodity, can be split in two types:
Gives insight about demand (GDP and business activity data of biggest consumers like China, Japan, South Korea, etc.).
Gives insight about supply outlook (crude inventories in the US - API and EIA data, Baker Hughes rig count, etc.)
Some of them which have weekly releases, like EIA data, can be used as news catalyst for regular news trading strategy (straddle, etc.). This is one of many trading approaches I use trading with Hotforex.