As stated previously, Scanning Tunneling Microscopy(STM) allows the detection of FOs. Although an in-depth discussion of STM conditions is outside the scope of this review, we would like to note that different experimental conditions may influence the observability of FOs. Temperature and bias voltage (sections 2.1 -2.3) are notoriously well-known to influence STM pictures of FOs. The general recommendation is to stick to low temperature and bias voltage. The same is true for the pressure. Although the latter should not influence the FOs, a higher pressure may result in bigger coverage that would prevent the observation of LDOS due to the formation of big islands and other structures. We believe that FOs may be responsible for this process due to surface-mediated interactions that we discuss in connection to the interaction potentials (section 2.4). We then proceed to discuss studies conducted on various surfaces (sections 2.5 -2.6) and their influence on the observed FOs. This section is wrapped up with a discussion of Friedel oscillations of anisotropic nature (section 2.7) or occurring due to the peculiar quasiparticles called skyrmions (section 2.8)