No, SPDR ETFs are not a good fit for a novice investor with a low level of financial literacy. In fact, there is no investment that is safe for an absolute beginner, not even a savings account. (An absolute beginner could easily overdraw his savings account, leading to fees and collections.)
I would say that an investment becomes a good fit for an investor as soon as said investor understands how the investment works. A savings account at a bank or credit union is fairly easy to understand and is therefore a suitable place to hold money after a few hours to a day of research. (Even after 0 hours of research, however, a savings account is still better than a sock drawer.)
Money market accounts (through a bank), certificates of deposit (through a bank), and money market mutual funds (through a mutual fund provider) are probably the next easiest thing to understand. This could take a few hours to a few weeks of research depending on the learner.
Equities, corporate bonds, and government bonds are another step up in complexity, and could take weeks or months of schooling to understand well enough to try. Equity or bond mutual funds -- or the ETF versions of those, which is what you asked about -- are another level after that.
Also important to understand along the way are the financial institutions and market infrastructure that exist to provide these products: banks, credit unions, public corporations, brokerages, stock exchanges, bond exchanges, mutual fund providers, ETF providers, etc.