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We study the motion of charged and spinning particles and photons in the $4D$charged Einstein-Gauss-Bonnet (EGB) black hole vicinity. We determine theradius of the innermost stable circular orbit (ISCO) for test particles. Weshow that the combined effect of the Gauss-Bonnet (GB) coupling parameter andblack hole charge decreases the ISCO and the radius of the photon sphere.Further, we study the gravitational deflection angle and show that the impactof GB term and black hole charge on it is quite noticeable. We also considerthe effect of plasma and find the analytical form of the deflection angle inthe case of a uniform and non-uniform plasma. Interestingly we find that thedeflection angle becomes larger when uniform plasma is considered in comparisonto the case of non-uniform plasma. We also study the center of mass energy($E_{C.M.}$) obtained by collision process for non-spinning particles and showthat the impact of GB parameter and black hole charge leads to high energycollision. In addition, we also study the $E_{C.M.}$ for the case of spinningparticles and show that if the two spinning particles collide near the horizonof $4D$ charged EGB BH, the $E_{C.M.}$ becomes infinitely high which is indisparity with the non-spinning particles counterpart where $E_{C.M.}$ nevergrows infinitely. To achieve this, an important role is played by the spinningparticle known as the \textit{near-critical} particle (i.e. a particle withfine-tuned parameters). In order to achieve the unbounded $E_{C.M}$ from thecollision of two spinning particles, the energy per unit mass must be less thanunity for a \textit{near-critical} particle, which means such a particle startsfrom some intermediate position $r>r_{h}$ and not from infinity.

Charged black hole in $4D$ Einstein-Gauss-Bonnet gravity: Particle motion, plasma effect on weak gravitational lensing and centre-of-mass energy