What is SCI, Scopus Indexed and H Index

SCI- Science Citation index (done by a company named Clarivate Analytics). If any journal is indexed as SCI, it should have an impact factor. SCI are considered good.
SCOPUS is another type of index which ranks lower than SCI. Always go for SCI rather than SCOPUS. All SCI indexed journals are also Scopus indexed but vice versa may not be true.
h-index in Google Scholar refers to a researcher's citation. If a person has minumum 4 of his papers cited 4 times or above for each paper, h-index is 4. If 8 of his papers cited 8 times or above, h-index is 8.
There is another index called i10 index. If a researcher's 10 papers have been cited 1 times each (minimum), i10 score is 1, if 10 papers cited 5 times, i10 is 5. I maybe wrong somewhere in this discussion. But to the best of my knowledge, these are correct.