Sleep training 9 month old. Help!

My daughter is 9 months old and we are beginning to put her in her own crib to sleep....

She is not happy at all. She stands up immediately and screams/cries/hyperventilates.... it’s making me so sad.

I’ve tried going in in intervals to reassure her, but it seems to make it much much worse, but it breaks my heart to just hear her cry endlessly.

What has helped other mamas that have gone through this??

I need tips and tricks and advice of what worked for you! I’m a first time mom and don’t know what I’m doing. Everything I read online is so overwhelming and I see so much different information....

Thanks!