Non-branded big cubes lock up easily. Look for magnetic NxNxN cubes for smoother turning.
A 7x7 solve can take 5–10 minutes for an intermediate cuber; focus on piece look-ahead rather than raw turning speed.
To pair two edge pieces (especially the last edges), use:
Solving larger cubes involves additional steps and more complex algorithms.
For those who prefer a more visual approach, PDF resources are an excellent way to learn Xnxnxnxn cube algorithms. Here are some popular PDF resources:
Clear diagrams showing which layers to move (e.g., lowercase u vs. uppercase U ).