What are the guidelines to avoid HIV or STIs in homosexual men?

Hello doctor,

I am a young homosexual man, and I am trying to strike the right balance between enjoying myself and avoiding the risk of HIV or STIs. The abundance of confusing and contradictory information on the internet has made it challenging to navigate, but I have attempted to create some guidelines for my own safety. Could you please assess if my approach is correct, or if I am mistaken?

Here is what I have come up with:

1. Limit the number of random partners, and always inquire about their HIV status before engaging in sexual activity.

2. Generally, oral sexual activity poses a lower risk for both HIV and other STIs, so I can usually participate in it without significant concern.

3. If I do not experience any sores or discharge within a few days after engaging in oral sex, I can reasonably assume that I have not contracted anything from that encounter.

4. When engaging in anal sexual activity, it is essential to use a condom.

5. Regularly undergo HIV testing every few months.

I would appreciate your insight on whether my thinking is according to best practices for sexual health and safety.

Kindly help.