In fact, the difference between SCI source journals and SCI collection is easy to distinguish. Journals included in SCI are not necessarily SCI source journals, but SCI source journals must be SCI. SCI includes not only academic journals, but also regular journals with special issues, supplements, conference papers, news documents and editors. Only regular academic journals retrieved by SCI can be used as source journals.
You can publish non-SCI publications or papers, especially if there are no explicit restrictions on publications, you can also publish other publications or publications. However, if there are clear restrictions and requirements, you cannot choose such publications or publications. It can be said that publications that can be retrieved and included by SCI have very high academic value and publishing value.