Bill is correct there are so many opinions expressed on forums that new people can become confused especially about blades. I recommend finding a blade chart and learning what the Mfr. recommends for different uses. The Olson one is one of the best as it gives most blade configurations and sizes with recommended uses. This provides a starting point. Determine what type projects interest you then what material check the chart for a recommended style and size then try a dozen maybe a different mfr ( a size 5 will be very close to a size 5 by a different mfr.) Getting into tooth count, blade thickness, tooth configuration can confuse me and I have 20 years experience. Thin wood use smaller blades thick wood use larger blades Metal use metal cutting blades. I have my favorite blades for cutting jigsaw puzzles ( FD Puzzle) Portraits ( FD new spiral and #1 Pegas mg) other than that wood, details and what I have determines.
Fredfret