Best beys/combos to learn with (solo testing)?

The biggest thing that I think I struggle with understanding in this game is Ratchets. Blades and Bits feel very easy to get, but the only ratchets that I feel like I completely understand are 1-XX, 2-XX, and 9-XX. I understand contact points and blade size, but things like resistance and the actual effects that 3-60 has on a bey vs 4-60 or 7-60 are lost to me. What are some builds that can help me better understand how the different ratchets work through practice? How much of an impact do ratchets like 3, 4, 5, or 7 have on composition?