As'Salamu Alaikum
JazakiAllahu khayr, sister for asking such doubts. It shall be a source of knowledge to others and shows your intrest in acquiring knowledge as well.
I shall repeat those seven destructive sins
it is recorded that Abu Hurayrah said that the Messenger of Allah said,
Avoid the seven great destructive sins. The people inquired, 'O Allah's Messenger! What are they' . He said ,
1. To join others in worship along with Allah,
2. to kill the life which Allah has forbidden except for a just cause,
3 . Magic,
4. to consume Riba,
5. to consume an orphan's wealth,
6. to turn away from the enemy and flee from the battlefield when the battle begins,
7. and to accuse chaste women, who never even think of anything that would tarnish their chastity and are good believers
Hope this clears your doubts as it is in simple words