>>76479225
If you can do it safely and without pain, then treat them like other lift (aka don't do something stupid to injure yourself).
>>76479183
If you enjoy it, sure. I'm not sure how worthwhile it'd be, but if you like it then yeah.
>>76479699
>to start using barbell?
If you can do a bodyweight squat comfortably, then you can use an unloaded barbell.
>barbell vs dumbbell
Try both. Especially when new, it's good to build familiarity with everything and try new movements. This'll also help you find your exercise preferences.
>dumbbell before barbell
If you feel like it, sure. No worries if you don't because it's just preference.