What is the best way to shave without getting red marks and ingrown hairs?

make sure your skin is clean where you are going to shave and use a hot towel to cover the surface for several seconds before you apply lather. This opens the pores and allows the hairs to be soft

What is the best way to shave without getting red marks and ingrown hairs?

use a cream instead

What is the best way to shave without getting red marks and ingrown hairs?

sounds like you need sensitive skin shaving gel, and I do suggest Gel as it helps me majorly avoid the red marks and ingrown hairs. Shave all down, don't back shave as this tends to increase your ingrown hairs as it can cut them off below the skin. The hot towel, hot water, shower before shaving is a good way to go. it softens the hairs and allows for a smoother/cleaner shave. Wash up afterward, doing a final rinse with cool water to re close your pores. Use after shave depending on your personal preference.

Also, avoid cheap single bladed bic razors, and the bargin bin types. I suggest Gillette 2 blade and 3 blade (Sensor and like) with the handle you keep and replace the blades on

What is the best way to shave without getting red marks and ingrown hairs?

Two words: electric razor.

What is the best way to shave without getting red marks and ingrown hairs?

always apply some moisturiser or lotion before you shave. shave with gilette sensitive skin gel