Exclusive IP Address Hong Kong

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Hello. Do you recommend a Dedicated IP? I have researched this concept. Although negative expressions are not used, some articles mention that if you don't have a large forum or e-commerce site, it is not necessary to get one. However, it is said that having a Dedicated IP reduces the chances of your emails ending up in the spam folder and can also help with SEO. In an article on Wmarac?, it is written in one of the points that "It is necessary for third-party software and applications." Is this requirement also valid for an SSL certificate? Because could the warning "Your connection to this site is not fully secure" be related to this? What are your recommendations on this matter?