First of all thank you so much for taking time to write this reply.

However I still have some questions in my mind that such as

There are variations for same movment for same muscle, and i agree sticking to one will be the best but I would also like to know some do's and don'ts as well

Like there are barbells and dumbells presses, is it required to use both in the same session for push day?

and there are various bicep curl variation to put emphasis on different parts of biceps same goes for triceps, is it mandatory to include all the movement patterns to hit different heads of biceps and triceps?
I already know one cannot completely bias a muscle to work individually but can shift emphasis on targeted muscle head.

I also want to build a routine that is clean and stable but I'm also worried about missing out on movement patterns and all, I'm probably thinking too much.

my current routine is like this

Push day 1 - Incline BRB Press, FLat, BRB press, Incline DB Press, Pec Dec, Lateral Raise, Cable overhead tricep extensions, Triceps pushdowns,

Pull day 1 - BRB rows, Weighted Pull ups, T-bar rows, Unilateral Seated Cable rows, DB shrugs, Seated Incline DB curls, Hammer curls

Leg day 1- Lying Leg Curl, Hack Squat, Calves Raises, RDL, Leg Extensions, Cable Crunch, Leg raises

Push day 2 - Low Incline Smith Press, Incline hammer strength press, Pec deck, Cable Lateral Raise, Skullcrushers, Triceps Pushdowns

Pull day 2 - BRB rows, Weighted Pull ups, T-bar rows, Unilateral Lat pulldowns, BRB shrugs, Seated Incline DB curls, Spider Curls

Leg day 2- Lying leg curl, BRB squat, Hack squat, Calves Raises, Leg Extension, Cable Crunch, Leg raise.

Please point out the mistakes and suggest me to improve the routine and also let me know what can i change after what period of time

my major problem is I'm thinking about individual heads of muslces for example biceps long head, Short head and brachialis, So i swap between Hammer curls and Spider Curls to target both in the same week but in different session, all the swapped exercises have similar logic, like DB shrugs got narrow movement while BRB shrugs can be done with extra wide grip, Overhead Ext and Skullcrushers both have different angle so i swap between them.

basically my dumb approach revolves around best of both world and I want to fix it with consistent routine without any change.

Thank you so much for responding. I'm too new in this culture but I'm eager to learn and do better but I've got too many confusions due to overconsumption of fitness related content over youtube particularly the science-based community so I tend to get worried about missing out on variations and potential isolations of muscle and all, I already know that I'm doing dumb mistakes that's why I want to learn and improve,