Things you should never offer to Lord Shiva
The use of any red-coloured material should not be used while worshipping Lord Shiva but mainly red flowers such as hibiscus flowers should not be used. This will anger Lord Shiva instead of making him happy.
You should not use shankh while worshipping Lord Shiva. A lot of people perform Jalabhishek with a shankh but it is forbidden as Shiva killed a demon named Shankhachurna. Therefore, shankh is not used in Shiva worship.
According to Shivpuran, a demon named Jalandhar was killed by the hands of Lord Shiva. Jalandhar was blessed with a boon that no one could defeat him as long as he drew strength from his wife's purity and chastity. But for Jalandhar to die, Lord Vishnu had to cheat Jalandhar's wife Tulsi. Angered by the death of her husband, Tulsi boycotted Lord Shiva.
Turmeric is never offered on Shivling because turmeric is believed to be related to women and Shivling is a symbol of masculinity. It is also believed that the effect of turmeric is hot, due to which it is considered forbidden to offer it on Shivling.