Welcome aboard Chuck. Just about any wood can be carved, one way or another. It is just that some are easier than others. Maple, Oak, etc., can be a challenge. Walnut, Butternut, Mahogany, Cherry.....a pleasure. Basswood , Pine, etc. can produce great results, but unless stained, burned or painted, leave the finish a bit.....er......dull, lacking in depth.
Carve what ever wood turns you on. Carve with edged tools. Carve with power. Carve with rasps and sandpaper. Carve.....just carve! No rules, just results. Edged tools used for harder woods need a sharper bevel or cut to them. More strength to the blade. Ie: Basswood uses say 15 - 22 degrees, compared to, Maple may use 35 - 40 degrees. Rick (Rick in Seattle) can tell you more accurately than I can, talk to him. He's our resident sharpening expert!
Again, welcome.
Bob