First one might ask what are consonants? The word says con- (= with) -sonants (sounds in a greater connectioin). Consonants are sounds that sound with others (usually vowels). The consonants are in French like in English: b, c, d, f, g, j, k, l, m,
n, p, q, r, s, t, v, w, x, (y), z.
Actually they should all be quite easy to pronounce, except for the r. Depending on the region you are coming from it will be more or less easy to create a French gutural r. But let's start with something different, the voiced and unvoiced sounds in French.